GRB181201A

This page lists all entries on GRB181201A in GRBweb

Summary IPN GCN 23469 GCN 23470 GCN 23471 GCN 23472 GCN 23473 GCN 23474 GCN 23475 GCN 23476 GCN 23477 GCN 23478 GCN 23479 GCN 23480 GCN 23481 GCN 23484 GCN 23485 GCN 23486 GCN 23488 GCN 23491 GCN 23492 GCN 23495 GCN 23497 GCN 23499 GCN 23501 GCN 23503 GCN 23504 GCN 23507 GCN 23510 GCN 23514 GCN 23518 GCN 23519 GCN 23522 GCN 23601

Summary table
Variable Value Source
T0 2:38:00 UTC GCN_circulars,Fermi LAT Det
ra 319.3208° IPN
decl -12.6333° IPN
pos_error 5.00e-02° IPN
redshift 0.4500
GBM_located False
mjd 58453.10972222222 GCN_circulars,Fermi LAT Det
IPN table
GRB_name GRB181201A
ra 319.3208°
decl -12.6333°
pos_error 5.00e-02°
GCN 23469 table
GRB_name GRB181201A
GCN_number 23469
Detection_method INTEGRAL
ra 319.3009°
decl -12.6242°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23469 SUBJECT: GRB 181201A: a long GRB detected by INTEGRAL DATE: 18/12/01 03:43:01 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: a gamma ray burst lasting about 180 s has been detected by IBAS in the IBIS/ISGRI data at 02:38 UT of 1 December 2018 The refined coordinates (J2000) are: R.A.= 319.3009 deg DEC.= -12.6242 deg with an uncertainty of 2 arcmin (90% c.l.). The burst was bright and saturated the telemetry. Therefore, we can only give lower limits to its peak flux of greater than 2 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of more than 1e-4 erg/cmq. A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN 23470 table
GRB_name GRB181201A
GCN_number 23470
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23470 SUBJECT: GRB 181201A MASTER-Net OT detection DATE: 18/12/01 10:15:47 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, A.V. Krylov, I. Gorbunov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk K. Ivanov, O. Gres, N.M. Budnev, S.Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the GRB181201.11 10 sec after notice time and 18 sec after trigger time at 2018-12-01 02:40:30 UT. On our first (10s exposure) set we found 1 optical transient within INTEGRAL error-box (ra=319.317 dec=-12.6325 r=0.05) brighter than 16.2. T-Tmid Date Time Expt. Ra Dec Mag -------|---------------------|-------|-----------------|-----------------|------ 23 2018-12-01 02:40:30 10 ( 21h 17m 11.2s , -12d 37m 51.4s) |13.17 The 5-sigma upper limit has been about 16.2mag The message may be cited. ==================================================================== The galactic latitude b = -39 deg., longitude l = 39 deg. The observations made on zenit distance = 76 deg.The moon (38 % bright part) below the horizon (The altitude of the Moon is -41 deg. ). The sun altitude is -30.9 deg. The object can be observed till 2018-12-01 03:49:27
GCN 23471 table
GRB_name GRB181201A
GCN_number 23471
Detection_method Swift-XRT Other
ra 21.0000°
decl -12.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23471 SUBJECT: GRB 181201A: likely Swift/XRT afterglow DATE: 18/12/01 10:23:45 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF S.Mereghetti, F.Pintore (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: The Swift XRT observed the position of GRB181201A starting 4 hr after the INTEGRAL trigger time, from 6:33 UT to 7:06 UT. A possibly fading X-ray source with count rate of 2.38+/-0.04 ct/s is detected inside the IBAS error circle at coordinates R.A. = 21 17 11 Dec.= -12 37 48 [GCN OPS NOTE(01dec18): Per author's request, indentification name of the burst was changed from "GRB 180112A" to "GRB 181201A" in both the SUBJECT line and in the first sentence of the circular.]
GCN 23472 table
GRB_name GRB181201A
GCN_number 23472
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23472 SUBJECT: GRB 181201A: Swift-XRT afterglow DATE: 18/12/01 12:12:37 GMT FROM: Sandro Mereghetti at IASF-Milano/INAF F.Pintore, S.Mereghetti (IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report: Swift/XRT observed the position of GRB181201A on 1 December 2018 from 6:33 UT to 7:06 UT (GCN #23471), in PC mode. The XRT data show that the X-ray source reported by Mereghetti et al. (GCN Circ. n. 23471 ) is fading and has an average spectrum well modelled by a single absorbed powerlaw. The best-fit parameters are: column density of (6 +\- 2)x10^20 cm-2, consistent with the Galactic column density (5.2e20 cm-2, Willingale et al.2013), photon index of 1.76 +\- 0.08. The average 0.3-10 keV absorbed flux is (1.06 +\- 0.06)x10^-10 erg cm-2 s-1. The time decay is well modeled with a power law of index 1.2 +\- 0.1
GCN 23473 table
GRB_name GRB181201A
GCN_number 23473
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23473 SUBJECT: GRB 181201A: Swift ToO observations DATE: 18/12/01 13:45:27 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the INTEGRAL GRB 181201A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00020848 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the INTEGRAL event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team.
GCN 23474 table
GRB_name GRB181201A
GCN_number 23474
Detection_method Swift-XRT Other
ra 319.2967°
decl -12.6308°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23474 SUBJECT: GRB 181201A: Swift-XRT afterglow detection DATE: 18/12/01 14:17:02 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), S. J. LaPorte (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the INTEGRAL-detected burst GRB 181201A (Mereghetti et al. GCN Circ. 23469), collecting 5.0 ks of Photon Counting (PC) mode data between T0+14.3 ks and T0+26.4 ks. Five uncatalogued X-ray sources are detected, of which one ("Source 5") is above the RASS limit, and is therefore likely the GRB afterglow. Using 4968 s of PC mode data and 3 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 319.29666, -12.63082 which is equivalent to: RA (J2000): 21h 17m 11.20s Dec(J2000): -12d 37' 51.0" with an uncertainty of 2.0 arcsec (radius, 90% confidence). This position is 28 arcsec from the INTEGRAL position. The light curve can be modelled with a power-law decay with a decay index of alpha=1.44 (+/-0.18). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.74 (+0.08, -0.07). The best-fitting absorption column is 6.1 (+2.0, -0.9) x 10^20 cm^-2, consistent with the Galactic value of 5.2 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.1 (+2.0, -0.9) x 10^20 cm^-2 Galactic foreground: 5.2 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 1.74 (+0.08, -0.07) If the light curve continues to decay with a power-law decay index of 1.44, the count rate at T+24 hours will be 0.30 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.2 x 10^-11 (1.3 x 10^-11) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00020848. The results of the full analysis of the XRT observations are available at http://www.swift.ac.uk/ToO_GRBs/00020848. This circular is an official product of the Swift-XRT team.
GCN 23475 table
GRB_name GRB181201A
GCN_number 23475
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23475 SUBJECT: GRB 181201A: iTelescope optical afterglow detection DATE: 18/12/01 15:48:16 GMT FROM: Albert Kong at NTHU A.K.H. Kong (NTHU, Taiwan) We observed the field of GRB 181201A (Mereghetti et al. GCN 23469) with the T31 0.5m telescope of iTelescope.Net in Siding Spring, Australia. The observation was done with the R-band filter beginning at 2018-12-01 10:56:18 UT (8.3 hours after the INTEGRAL trigger) for 300 sec. At the position of the Swift X-ray afterglow (Mereghetti et al. GCN 23471; Page et al. GCN 23474), an optical transient is clearly detected with a R magnitude of 16.68 +/- 0.03 by comparing with the USNO-B1 catalogue. The position is also consistent with the optical transient detected by Podesta et al. (GCN 23470) 18 sec after the trigger. Given the fading of the optical brightness, this transient is the optical afterglow of GRB 181201A.
GCN 23476 table
GRB_name GRB181201A
GCN_number 23476
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23476 SUBJECT: GRB 181201A MASTER-Net OT continued observation DATE: 18/12/01 17:24:28 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the GRB181201A (Mereghetti et al., GCN #23469) ~13.3 hours after trigger time at 2018-12-01 15:57:35 UT. On our first (180s exposure) set we found optical transient detected by MASTER-OAFA (Podesta et al, GCN 23470; Gorbovskoy et al., Atel #12255; also observed by Kong GCN #23475;). T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 47915s 2018-12-01 15:57:35 180 (21h 17m 11.11s , -12d 37m 50.9s) 17.6 The 5-sigma upper limit has been about 18.3 mag The galactic latitude b = -39 deg., longitude l = 39 deg. The observations made on zenit distance = 64 deg.The moon (32 % bright part) below the horizon (The altitude of the Moon is -41 deg. ). The sun altitude is -25.6 deg. The object can be observed till sunrise at 2018-12-02 04:21:42 UT. The message may be cited.
GCN 23477 table
GRB_name GRB181201A
GCN_number 23477
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23477 SUBJECT: GRB 181201A: optical observations in SAAO DATE: 18/12/01 20:06:16 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (IKI), E. Mazaeva (IKI), D. Buckley (SAAO), A. Pozanenko (IKI) report on behalf of IKI-FuN follow-up collaboration: We observed the field of the INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with 1m telescopes of SAOO observatory. Observation started on Dec. 01 (UT) 18:34:35 in g'Ri'-filters. We detected optical afterglow (Podesta et al., GCN 23470; Kong GCN 23475). Preliminary photometry is following Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2018-12-01 18:34:35 0.66950 g' 5*180 17.86 0.02 2018-12-01 18:52:05 0.67992 R 5*120 17.38 0.02 2018-12-01 19:02:35 0.68721 i' 5*120 17.32 0.02 The photometry is based on SDSS DR12 nearby stars.
GCN 23478 table
GRB_name GRB181201A
GCN_number 23478
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23478 SUBJECT: GRB 181201A: NOT optical observations DATE: 18/12/01 21:41:15 GMT FROM: Kasper Elm Heintz at Univ. of Iceland and DAWN/NBI Kasper E. Heintz (Univ. of Iceland), Daniele B. Malesani (DAWN/NBI and DARK/NBI), and Shane Moran-Kelly (Univ. of Turku and NOT), report on behalf of a larger collaboration: We observed the optical afterglow (Podesta et al., GCN 23470; Kong, GCN 23475; Lipunov et al., GCN 23476: Volnova et al., GCN 23477) of the INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with the 2.5-m Nordic Optical Telescope (NOT) equipped with StanCam. Observations were carried out in the Bessel R filter, but calibrated against SDSS r-band Pan-STARRS local photometry, corrected to the R-band using the Lupton transformation. At a mid-time of 20:27:09 UT on December 1 (i.e. 17.8 hr after trigger) we measure for the optical counterpart: r = 17.5 +/- 0.1 AB mag, where the error is dominated by scatter in the preliminary calibration.
GCN 23479 table
GRB_name GRB181201A
GCN_number 23479
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23479 SUBJECT: GRB 181201A: Zeiss-1000/CrAO optical observations DATE: 18/12/01 23:21:37 GMT FROM: Alina Volnova at SAI MSU E. Mazaeva (IKI), A. Volnova (IKI), A. Pozanenko (IKI), I. Nikolenko (CrAO), A. Novichonok (KIAM, PetrSU), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration: We observed the field of the INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with Zeiss-1000/Koshka (CrAO) telescope starting Dec 01, 16:55:28 UT. We obtained several frames in R filter. The optical afterglow (Podesta et al., GCN 23470; Kong, GCN 23475) is clearly detected in the stacked frame. Preliminary photometry is following: Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2018-12-01 16:55:28 0.60359 R 23*60 17.17 0.05 The photometry is based on SDSS DR12 nearby stars.
GCN 23480 table
GRB_name GRB181201A
GCN_number 23480
Detection_method Fermi LAT Det
t_trigger 2:38:00 UTC
ra 319.2800°
decl -12.6000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23480 SUBJECT: GRB 181201A: Fermi-LAT detection DATE: 18/12/02 02:41:40 GMT FROM: Magnus Axelsson at Stockholm U. M. Arimoto (Kanazawa U.), M. Axelsson (KTH & Stockholm Univ.), and M. Ohno (Hiroshma U.) report on behalf of the Fermi-LAT team: On December, 01, 2018, Fermi-LAT detected high-energy emission from GRB 181201A, which was also detected by INTEGRAL (Mereghetti et al., GCN 23469) and Swift/XRT (Pintore et al., GCN 23472). The best LAT on-ground location is found to be RA, Dec = 319.28, -12.60 (degrees, J2000) with an error radius of 0.06 deg (90% containment, statistical error only). This was 131 deg from the LAT boresight at the time of the INTEGRAL trigger: T0 = 02:38:00 UT and entered the LAT field of view ~2000 seconds later. The data from the Fermi-LAT show a significant increase in the event rate that is spatially correlated with the INTEGRAL source (0.03 degrees from the INTEGRAL location) with high significance. The photon flux above 100 MeV in the time interval 2000-10000 s after the INTEGRAL trigger is (4.5 +/- 3.3) E-7 ph/cm2/s. The estimated photon index above 100 MeV is -1.32+/-0.39. The highest-energy photon is a 25.5 GeV event which is observed ~7600 seconds after the INTEGRAL trigger. The Fermi-LAT point of contact for this burst is Masanori Ohno (ohno@astro.hiroshima-u.ac.jp). The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN 23481 table
GRB_name GRB181201A
GCN_number 23481
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23481 SUBJECT: GRB 181201A: COATLI Optical Detection DATE: 18/12/02 06:37:42 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Margarita Pereyra (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), William H. Lee (UNAM), Carlos Román-Zúñiga (UNAM), Alexander Kutyrev (GSFC), and Eleonora Troja (GSFC), report: We observed the field of GRB 181201A (Mereghetti et al., GCN 23469) with the COATLI 50-cm telescope and interim imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir (http://coatli.astroscu.unam.mx) from 2018-12-02 01:39:01 to 04:02:58 (from 23.0 to 25.4 hours after the trigger), obtaining a total of 1.89 hours of exposure in the w filter. We detect the optical counterpart reported by Podesta et al. (GCN Circ. 23470) at w = 17.82 +/- 0.01. Our w magnitudes are calibrated against the USNO-B1 catalog (adjusted to an approximate AB system) and are not corrected for Galactic extinction in the direction of the GRB. We thank the COATLI technical team (Fernando Ángeles, Oscar Chapa, Salvador Cuevas, Alejandro Farah, Jorge Fuentes, Rosalía Langarica, Fernando Quirós, and Carlos Tejada) and the staff of the Observatorio Astronómico Nacional.
GCN 23484 table
GRB_name GRB181201A
GCN_number 23484
Detection_method Optical
ra 319.2967°
decl -12.6309°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23484 SUBJECT: GRB 181201A: Global MASTER-Net prompt optical descovery and afterglow observations DATE: 18/12/02 10:26:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the INTEGRAL GRB181201A ((Mereghetti et al., GCN #23469) 10 sec after notice time and 18 sec after trigger time at 2018-12-01 02:40:30 UT. We discovered prompt growing (one mag per minute) optical flash MASTER OT J211711.20-123751.4 (Podesta et al., GCN #23470; Gorbovskoy et al., Atel #12255) at RA,Dec = 21h 17m 11.20s -12d 37m 51.4s Later we observed afterglow at MASTER-Kislovodsk (Lipunov et al., #23476), MASTER-SAAO, MASTER-IAC and MASTER-OAFA against in B,V,R,I and Clear fiters. Observations are continuated. This message can be cited.
GCN 23485 table
GRB_name GRB181201A
GCN_number 23485
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23485 SUBJECT: GRB 181201A: optical observations in Chilescope observatory DATE: 18/12/02 13:19:51 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), M. Krugov (AFIF) report on behalf of IKI-FuN follow-up collaboration: We observed the field of the INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with RC-1000 telescope of CHILESCOPE observatory. Observations started on Dec. 02 (UT) 01:11:25 in r'-filter. We detected optical afterglow (e.g. Podesta et al., GCN 23470; Kong, GCN 23475; Lipunov et al., GCN 23476: Volnova et al., GCN 23477; Heintz et al., GCN 23478; Mazaeva et al., GCN 23479). Preliminary photometry is following. Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2018-12-02 01:11:25 0.9416 r' 300 18.00 0.05 The photometry is based on the SDSS DR12 star SDSS-DR12_id r J211710.81-123706.3 16.517
GCN 23486 table
GRB_name GRB181201A
GCN_number 23486
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23486 SUBJECT: GRB 181201A: GROND detection of the afterglow and redshift upper limit of z < 3 DATE: 18/12/02 15:19:53 GMT FROM: Jan Bolmer at MPE/Garching J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report: We observed the field of GRB 181201A (INTEGRAL trigger; Mereghetti et al., GCN #23469) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 00:16 UT, 21.85 hrs after the GRB trigger, and were performed under good seeing conditions, 1.03'', and at an average airmass of 1.43. We detect a source at a position consistent with the X-ray and optical afterglow (Page et al., GCN #23474; Podesta et al., GCN #23470; Heintz et al., GCN #23478). Based on the first 17 min of total exposures in g'r'i'z' and 20 min in JHK, we measure the following preliminary AB magnitudes: g' = 18.14 +/- 0.03 mag r' = 17.97 +/- 0.03 mag i' = 17.80 +/- 0.03 mag z' = 17.64 +/- 0.03 mag J = 17.55 +/- 0.05 mag H = 17.28 +/- 0.05 mag K = 17.13 +/- 0.08 mag Given magnitudes are calibrated against SDSS and 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.05 in the direction of the burst (Schlafly & Finkbeiner 2011). From a fit to the SED with a simple powerlaw including SMC-like dust extinction and a model for absoprtion from the Lyman-alpha forest we determine an upper limit for the redshift of z < 3 and A_V < 0.10 mag. The powerlaw index is -0.50.
GCN 23488 table
GRB_name GRB181201A
GCN_number 23488
Detection_method Optical
redshift 0.4500
Circular_text TITLE: GCN CIRCULAR NUMBER: 23488 SUBJECT: GRB 181201A: VLT/FORS2 tentative spectroscopic redshift DATE: 18/12/02 16:53:48 GMT FROM: Alexander Kann at IAA-CSIC L. Izzo, A. de Ugarte Postigo, D. A. Kann (all HETH/IAA-CSIC), D. B. Malesani (DAWN/NBI/DTU and DARK/NBI), K. E. Heintz (Univ. of Iceland), N. R. Tanvir (Univ. Leicester), V. D'Elia (SSDC), K. Wiersema (Univ. Warwick), C. Kouveliotou (GWU), and A. J. Levan (Univ. Warwick) report on behalf of the Stargate collaboration: We observed the optical counterpart (Podesta et al., GCN #23470; Kong, GCN #23475; Lipunov et al., GCN #23476; Volnova et al., GCN #23477; Heintz et al., GCN #23478; Mazaeva et al., GCN #23479; Watson et al., GCN #23481; Belkin et al., GCN #23485; Bolmer & Schady, GCN #23486) of the long, very bright INTEGRAL GRB 181201A (Mereghetti et al., GCN #23469) with the ESO VLT UT1 equipped with the FORS2 spectrograph. We obtained a single 600 s spectrum in the low-resolution grism 300V. Observations started at 00:50:50 UT on December 2 (i.e., 22.16 hr after trigger). In the spectrum, the continuum is detected at excellent signal-to-noise but is largely featureless. From a non-detection of any break in the continuum down to 3500 Ã…, we derive a redshift upper limit of z < 1.88. There are no strong lines visible, but we note the possible presence of three weak lines, which, if real, can be identified as the Mg II doublet and Mg I, implying a redshift of z = 0.450. No emission lines are visible. Pan-STARRS archive imaging (Chambers et al. 2016, arXiv:1612.05560) shows the presence of a possible host galaxy at i' ~ 23.4 mag. We acknowledge the ESO observing staff at Paranal, especially Cedric Ledoux, Joe Anderson, and Rodrigo Tomero. We are also indebted to the ESPRESSO commissioning team who kindly granted us permission to carry out this ToO observation during their time.
GCN 23491 table
GRB_name GRB181201A
GCN_number 23491
Detection_method Fermi LAT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23491 SUBJECT: GRB 181201A: Insight-HXMT/HE detection DATE: 18/12/03 01:41:51 GMT FROM: Ce Cai at IHEP C. Cai, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, J. L. Zhao, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, H. Y. Wang, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team: At 2018-12-01T02:39:53.000 (T0), the Insight-HXMT/HE detected GRB 181201A (trigger ID: HEB181201111) in a routine search of the data, which was also triggered by INTEGRAL (S. Mereghetti et al.,GCN 23469); Fermi/LAT (M. Arimoto et al., GCN23480). The Insight-HXMT/HE light curve mainly consists of Single pulse with a duration (T90) of 15.18 s measured from T0+1.56 s. The 1-s peak rate, measured from T0+5.28 s, is 13844.5 cnts/s. The total counts from this burst is 88444.0 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB181201111_lc.jpg All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope. Insight-HXMT is the first Chinese space X-ray telescope, which was fundedjointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information could be found at: http://www.hxmt.org.
GCN 23492 table
GRB_name GRB181201A
GCN_number 23492
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23492 SUBJECT: GRB 181201A: Further COATLI Optical Monitoring DATE: 18/12/03 07:12:44 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), William H. Lee (UNAM), Margarita Pereyra (UNAM), Carlos Román-Zúñiga (UNAM), Alexander Kutyrev (GSFC), and Eleonora Troja (GSFC), report: We observed the field of GRB 181201A (Mereghetti et al., GCN 23469) with the COATLI 50-cm telescope and interim imager at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir (http://coatli.astroscu.unam.mx) from 2018-12-03 01:30:45 to 04:14:39 (from 46.9 to 49.6 hours after the trigger), obtaining a total of 1.5 hours of exposure in the w filter. We continue to detect the optical counterpart reported by Podesta et al. (GCN Circ. 23470) at w = 18.77 +/- 0.02. The counterpart has faded by about 1 magnitude since our previous observations (Watson et al., GCN 23481). Further observations are planned. Our w magnitudes are calibrated against the USNO-B1 catalog (adjusted to an approximate AB system) and are not corrected for Galactic extinction in the direction of the GRB. We thank the COATLI technical team (Fernando Ángeles, Oscar Chapa, Salvador Cuevas, Alejandro Farah, Jorge Fuentes, Rosalía Langarica, Fernando Quirós, and Carlos Tejada) and the staff of the Observatorio Astronómico Nacional.
GCN 23495 table
GRB_name GRB181201A
GCN_number 23495
Detection_method Konus-Wind Det
t_trigger 2:39:52.355 UTC
redshift 0.4500
Circular_text TITLE: GCN CIRCULAR NUMBER: 23495 SUBJECT: Konus-Wind observation of GRB 181201A DATE: 18/12/03 16:42:48 GMT FROM: Dmitry Svinkin at Ioffe Institute D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report: The long-duration GRB 181201A (INTEGRAL-IBIS/ISGRI detection: Mereghetti et al., GCN Circ. 23469; Insight-HXMT/HE detection: Cai et al., GCN Circ. 23491) triggered Konus-Wind at T0=9592.355 s UT (02:39:52.355). The burst light curve consists of two well-separated pulses with the first pulse staring at ~T0-115 s, and a total burst duration of ~172 s. The emission is seen up to ~15 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB181201_T09592/ As observed by Konus-Wind, the burst had a fluence of 1.99(-0.06,+0.06)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+4.848 s, of 2.88(-0.33,+0.34)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum of the burst (measured from T0 to T0+34.816 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.25(-0.05,+0.05), the high energy photon index beta = -2.73(-0.12,+0.11), the peak energy Ep = 152(-6,+6) keV (chi2 = 114/97 dof). The spectrum near the maximum count rate (measured from T0+4.352 to T0+4.864 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.75(-0.16,+0.19), the high energy photon index beta = -2.76(-0.38,+0.21), the peak energy Ep = 207(-24,+26) keV (chi2 = 51/49 dof). Assuming the redshift z=0.450 (Izzo et al., GCN Circ. 23488) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~1.0x10^53 erg, the peak luminosity L_iso is ~2.2x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~220 keV. All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN 23497 table
GRB_name GRB181201A
GCN_number 23497
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23497 SUBJECT: GRB 181201A: continued optical observations in SAAO and Chilesope DATE: 18/12/03 17:38:47 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (IKI), E. Mazaeva (IKI), S. Belkin (IKI), D. Buckley (SAAO), M. Krugov (AFIF), A. Pozanenko (IKI) report on behalf of IKI-FuN follow-up collaboration: We continue multicolor observation the optical afterglow (e.g. Podesta et al., GCN 23470; Kong GCN 23475) of INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with 1m telescopes of SAAO (SAAO40in) and Chilescope (RC1000) observatories. Preliminary photometry is following Date UT start t-T0 Filter Exp. OT Err. Telescope (mid, days) (s) 2018-12-02 19:09:26 1.69544 r' 2*600 18.69 0.02 SAAO40in 2018-12-02 19:30:07 1.70980 i' 2*600 18.54 0.07 SAAO40in 2018-12-02 19:50:44 1.72759 g' 3*600 19.07 0.05 SAAO40in 2018-12-03 01:32:26 1.95794 r' 600 18.92 0.04 RC1000 The photometry is based on the SDSS DR12 star SDSS-DR12_id g r i J211710.81-123706.3 17.191 16.517 16.257
GCN 23499 table
GRB_name GRB181201A
GCN_number 23499
Detection_method Swift-UVOT Det
ra 319.2965°
decl -12.6308°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23499 SUBJECT: GRB 181201A: Swift/UVOT Detection DATE: 18/12/04 00:22:12 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and J. K. Cannizzo (NASA/UMBC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 18201A 14.3 ks after the INTEGRAL trigger (Mereghetti et al., GCN Circ. 23469). We confirm the optical afterglow initially reported by MASTER (Podeta et al., GCN Circ. 23470, Kong, GCN Circ. 23475, Volnova et al., GCN Circ. 23477, Mazaeva et al., GCN Circ. 23479, Watson et al., GCN Circ. 23481, Belkin et al., GCN Circ. 23485, Bolmer and Schady, GCN Circ. 23486, Cai et al., GCN Circ. 23491). The position of the afterglow is also consistent with the XRT afterglow (Page et al., GCN Circ. 23474). The detection of the afterglow in the uvw2 filter would be consistent with the redshift report by Izzy et al. (GCN Circ. 23488). The preliminary UVOT position is: RA (J2000) = 21:17:11.17 = 319.29656 (deg.) Dec (J2000) = -12:37:51.0 = -12.63084 (deg.) with an estimated uncertainty of 0.2 arc sec. (radius, 90% confidence). Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) are: Filter T_start(s) T_stop(s) Exp(s) Mag uvw2 14310 26435 4901 15.39 +/- 0.02 white 56416 74104 924 17.53 +/- 0.03 white 148341 165117 1162 18.71 +/- 0.04 v 56713 74204 535 17.70 +/- 0.10 v 160066 165389 389 18.70 +/- 0.26 u 56120 77881 2757 17.25 +/- 0.03 u 148114 164276 2896 18.30 +/- 0.05 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN 23501 table
GRB_name GRB181201A
GCN_number 23501
Detection_method AstroSat CZTI
Circular_text TITLE: GCN CIRCULAR NUMBER: 23501 SUBJECT: GRB 181201A: AstroSat CZTI detection DATE: 18/12/04 05:29:05 GMT FROM: Vidushi Sharma at IUCAA T. Khanam, V. Sharma and A. Vibhute (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration: Analysis of AstroSat CZTI data showed the detection of a long GRB 181201A, which was also detected by Integral-IBIS/ISGRI detection (Mereghetti S. et al., GCN 23469), Insight-HXMT/HE detection (Cai C. et al., GCN 23491) and Konus-Wind (Svinkin D. et al., GCN 23495). The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 02:39:58.020 UT, ~2 min after the Integral-IBAS trigger. The measured peak count rate is 910.8 cts/s above the background in combined data of four quadrants, with a total of 6099 cts. The local mean background count rate was 569 cts/s. Using cumulative rates, we measure a T90 of 19.2 s. In preliminary analysis, we find that 402 compton events are associated with this event. It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN 23503 table
GRB_name GRB181201A
GCN_number 23503
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23503 SUBJECT: GRB181201A: GOTO optical observations DATE: 18/12/04 14:09:38 GMT FROM: Danny Steeghs at U.of Warwick/GOTO G.Ramsay (Armagh O.), J.Lyman, K.Ulaczyk, D.Steeghs, K.Wiersema (U. Warwick), M.Dyer (U. Sheffield), B.Gompertz, A.Levan, R.Cutter (U. Warwick) K. Ackley, D.Galloway, E.Rol (Monash U.), V.Dhillon (U. Sheffield), P.O'Brien, R.Starling (U. Leicester), S.Poshyachinda (NARIT), D.Pollacco (U. Warwick), E.Thrane (Monash U.), E.Palle (IAC) report on behalf of the GOTO collaboration: The Gravitational-wave Optical Transient Observer observed the field of the long duration GRB 181201A (Mereghetti et al. GCN Circ. 23469, Page et al. GCN Circ. 23474) from Roque de los Muchachos Observatory. We report two optical photometric detections, both made using a combined L-band image (400-700nm passband), each with a total exposure time of 300s. The resulting preliminary magnitudes are based on a comparison to Panstarrs g-band calibrators and include a systematic error component due to the calibration uncertainty. midpoint time elapsed since burst g 2018-12-01 19:33:18 UT 0.705 days 17.74+/-0.10 mag 2018-12-03 19:41:21 UT 2.711 days 19.48+/-0.15 mag GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT) and the Instituto de Astrofisica de Canarias (IAC) (https://goto-observatory.org/)
GCN 23504 table
GRB_name GRB181201A
GCN_number 23504
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23504 SUBJECT: GRB 181201A: Continued GROND observations show that afterglow is still bright DATE: 18/12/04 15:06:49 GMT FROM: Jan Bolmer at MPE/Garching J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report: We observed again the field of GRB 181201A (INTEGRAL trigger; Mereghetti et al., GCN #23469) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile). Observations started at 01:01 UT on 4. of Dezember 2018, about three days after the GRB trigger, and were performed under poor seeing conditions, 2.2'', and at an average airmass of 2.0. We still detect the afterglow and based on 17 min of total exposure time, we measure the following preliminary r'-band AB magnitude, indicating that the afterglow is still reltively bright, even three days after the detection of the prompt emission: r' = 19.43 +/- 0.03 mag Given magnitude is calibrated against SDSS and not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.05 in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN 23507 table
GRB_name GRB181201A
GCN_number 23507
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23507 SUBJECT: GRB 181201A: continued optical observations in TSHAO DATE: 18/12/04 18:59:33 GMT FROM: Alexei Pozanenko at IKI, Moscow I. Reva (AFIF), M. Krugov (AFIF), A. Volnova (IKI), E. Mazaeva (IKI), S. Belkin (IKI), A. Pozanenko (IKI) report on behalf of IKI-FuN follow-up collaboration: We continue observations the optical afterglow (e.g. Podesta et al., GCN 23470; Kong GCN 23475) of INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory. Preliminary photometry of the afterglow in R-filter on December 04 is following Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2018-12-04 12:19:26 3.4202 R 2400 19.67 0.07 The photometry is based on the SDSS-DR12 star SDSS-DR12_id R(Lupton) J211710.81-123706.3 16.296
GCN 23510 table
GRB_name GRB181201A
GCN_number 23510
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 23510 SUBJECT: GRB181201A: Optical afterglow measurements by GROWTH-India DATE: 18/12/05 05:07:03 GMT FROM: Varun Bhalerao at Indian Inst of Tech Shubham Srivastava (IITB), Harsh Kumar (IITB), Stanzin Otzer (IIA), Kishalay De (Caltech), Varun Bhalerao (IITB), G C Anupama (IIA) and Mansi Kasliwal (Caltech) report on behalf of the GROWTH collaboration: The long duration GRB181201A (Mereghetti et al., GCN 23469, Sharma et al., 23501) was observed by the GROWTH-India telescope in the g-band for an integration time of 600s. The afterglow was clearly detected, and the magnitude was calibrated using field stars from the PS1 catalog. t_mid delta_t mag mag_err 2018-12-04 13:27:45 UT 3.4512 19.97 0.13 The GROWTH India telescope is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA). The data were obtained as part of the GROWTH Winter School at IIT Bombay with 70 participants - http://growth.caltech.edu/growth-winter-school-2018.html
GCN 23514 table
GRB_name GRB181201A
GCN_number 23514
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23514 SUBJECT: GRB 181201A: continued optical observations in TSHAO and Chilesope DATE: 18/12/05 20:49:30 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), I. Reva (FAI), A. Pozanenko (IKI), A. Volnova (IKI), E. Mazaeva (IKI), A. Kusakin (FAI), M. Krugov (FAI), D. Buckley (SAAO) report on behalf of IKI-FuN follow-up collaboration: We continue multicolor observations the optical afterglow (e.g. Podesta et al., GCN 23470; Kong GCN 23475) of INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with 1m telescopes of TSHAO (Zeiss-1000) and Chilescope (RC1000) observatories. Preliminary photometry is following Date UT start t-T0 Filter Exp. OT Err. Telescope (mid, days) (s) 2018-12-05 01:04:38 3.92822 r' 1200 19.74 0.05 RC-1000 2018-12-05 12:17:22 4.42306 R 2280 19.82 0.07 Zeiss-1000/TSHAO The photometry is based on the SDSS-DR12 star SDSS-DR12_id g r i R(Lupton) J211710.81-123706.3 17.191 16.517 16.257 16.296
GCN 23518 table
GRB_name GRB181201A
GCN_number 23518
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23518 SUBJECT: GRB 181201A: ALMA detection of a fading mm afterglow DATE: 18/12/07 17:08:24 GMT FROM: Tanmoy Laskar at UC Berkeley T. Laskar (University of Bath), E. Berger (Harvard), R. Chornock (Ohio University), W. Fong (Northwestern), R. Margutti (Northwestern), C. G. Mundell (University of Bath), and P. Schady (University of Bath) report on behalf of a larger collaboration: "We observed GRB 181201A (Mereghetti et al. GCN 23469) with the Atacama Large Millimeter/Submillimeter Array (ALMA) starting at 0.9 d after the burst at 90 GHz. Preliminary analysis reveals a bright (S/N > 150), fading mm counterpart at a location consistent with the X-ray position (Page et al. GCN 23474) and optical position (Podesta et al., GCN 23470; Lipunov et al., GCN 23476, GCN 23484; Siegel & Cannizzo, GCN 23499). Follow-up observations are planned. We thank the JAO staff, AoD, and the ALMA team for their help with these observations."
GCN 23519 table
GRB_name GRB181201A
GCN_number 23519
Detection_method VLA Det
ra 319.2966°
decl -12.6309°
Circular_text TITLE: GCN CIRCULAR NUMBER: 23519 SUBJECT: GRB 181201A: VLA detection DATE: 18/12/07 18:52:33 GMT FROM: Tanmoy Laskar at UC Berkeley T. Laskar (University of Bath), E. Berger (Harvard), R. Chornock (Ohio University), W. Fong (Northwestern), R. Margutti (Northwestern), C. G. Mundell (University of Bath), and P. Schady (University of Bath) report on behalf of a larger collaboration: "We observed GRB 181201A (Mereghetti et al. GCN 23469) with the Karl G. Jansky Very Large Array (VLA) beginning on 2018 December 04.02 UT (2.9 d after the burst). At a mean frequency of 6.0 GHz, we detect a radio source at the position RA (J2000) = 21:17:11.185 +/- 0.001 Dec (J2000) = -12:37:51.37 +/- 0.03 consistent with the position of the optical afterglow (Podesta et al., GCN 23470; Lipunov et al., GCN 23476, GCN 23484; Siegel & Cannizzo, GCN 23499) and the XRT afterglow (Page et al. GCN 23474). Follow-up observations are planned. We thank the VLA staff for rapidly executing these observations."
GCN 23522 table
GRB_name GRB181201A
GCN_number 23522
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23522 SUBJECT: GRB 181201A: continued optical observations in Mondy DATE: 18/12/09 20:12:31 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), E. Klunko (ISTP), S. Belkin (IKI), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of of larger GRB follow-up collaboration: We continue observations the optical afterglow (e.g. Podesta et al., GCN 23470; Kong GCN 23475) of INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with AZT-33IK telescope of Sayan observatory (Mondy). Preliminary photometry of the OT is following. Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2018-12-03 11:24:39 2.38658 R 30*120 18.91 0.03 2018-12-05 11:26:24 4.38780 R 30*120 20.03 0.09 2018-12-07 10:57:13 6.36753 R 30*120 20.23 0.05 The photometry is based on the SDSS-DR12 star SDSS-DR12_id R(Lupton) J211710.81-123706.3 16.3
GCN 23601 table
GRB_name GRB181201A
GCN_number 23601
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 23601 SUBJECT: GRB 181201A: photometric signature of the SN DATE: 19/01/03 20:40:28 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), E. Mazaeva (IKI), A. Pozanenko (IKI), P. Minaev (IKI), A. Volnova (IKI), N. Tominaga (Konan University), S. Blinnikov (ITEP), D. Chestnov (KIAM), E. Klunko (ISTP), I. Reva (FAPI), V. Rumyantsev (CrAO), D. Buckley (SAAO), R. Ya. Inasaridze (AbAO) report on behalf of GRB-FuN collaboration: We observed the optical afterglow (e.g. Podesta et al., GCN 23470; Kong GCN 23475) of the INTEGRAL GRB 181201A (Mereghetti et al., GCN 23469) with Gemini-N telescope on Dec. 22 in g'r'i'z and Dec. 24 in r'i'-filters. Preliminary photometry of the OT is following. Date t-T0 Filter Exp. OT Err. (mid, days) (s) 2018-12-22 21.10536 i' 3*180 21.50 0.03 2018-12-22 21.09536 r' 3*180 21.82 0.03 2018-12-24 23.09418 i' 3*180 21.32 0.06 2018-12-24 23.10793 r' 3*240 21.83 0.03 The photometry is based on the SDSS-DR12 star SDSS-DR12_id i' r' J211710.81-123706.3 16.257 16.517 Based on our previous observations and photometry reported in GCNs 23475, 23478, 23486, 23504 we plot a light curve of the afterglow in r'-filter (http://grb.rssi.ru/GRB181201A/GRB181201A_optics_fit.png). Power law approximation of the LC before 2018-12-22 has an index of 1.19 +/-0.01. The photometry obtained on 2018-12-22 and 2018-12-24 has a significance of about 2 and 6.5 sigma above the power law approximation. Additionally the i'-magnitude increases between the two epochs. We can suggest that we observed the Supernova signature associated with GRB 181201A.