GRB160121A

This page lists all entries on GRB160121A in GRBweb

Summary IPN Swift GCN 18912 GCN 18913 GCN 18917 GCN 18918 GCN 18919 GCN 18920 GCN 18921 GCN 18922 GCN 18923 GCN 18924 GCN 18925 GCN 18933 GCN 18935

Summary table
Variable Value Source
T0 13:50:37 UTC GCN_circulars,Swift Det
ra 109.0881° Swift
decl -23.5921° Swift
pos_error 1.94e-04° Swift
T90 12.0 s Swift
T90_start 13:50:37 UTC Swift
fluence 6.10e-07 erg/cm² Swift
redshift 1.9600
T100 12.0 s
GBM_located False
mjd 57408.57681712963 GCN_circulars,Swift Det
IPN table
GRB_name GRB160121A
ra 109.0792°
decl -23.5833°
pos_error 5.00e-02°
redshift 1.9600
Swift table
GRB_name GRB160121A
t_trigger 13:50:37 UTC
ra 109.0881°
decl -23.5921°
pos_error 1.94e-04°
T90 12.0 s
fluence 6.10e-07 erg/cm²
redshift 1.9600
GCN 18912 table
GRB_name GRB160121A
GCN_number 18912
Detection_method Swift Det
t_trigger 13:50:37 UTC
ra 109.0790°
decl -23.5780°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18912 SUBJECT: GRB 160121A: Swift detection of a burst DATE: 16/01/21 14:02:13 GMT FROM: David Burrows at PSU/Swift L. M. Z. Hagen (PSU), D. N. Burrows (PSU), P.A. Evans (U Leicester), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), F. E. Marshall (NASA/GSFC), L. M. McCauley (PSU), K. L. Page (U Leicester) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team: At 13:50:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160121A (trigger=671231). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 109.079, -23.578 which is RA(J2000) = 07h 16m 19s Dec(J2000) = -23d 34' 40" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single FRED- shaped peak with a duration of about 15 sec. The peak count rate was ~1700 counts/sec (15-350 keV), at ~2 sec after the trigger. The XRT began observing the field at 13:52:08.7 UT, 91.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 109.0890, -23.5920 which is equivalent to: RA(J2000) = 07h 16m 21.35s Dec(J2000) = -23d 35' 31.3" with an uncertainty of 2.4 arcseconds (radius, 90% containment). This location is 60 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 5.26 x 10^21 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of nominal 250.000 seconds with the U filter starting 151 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. Data from the 2.7'x2.7' sub-image are not available at this time. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.66. Burst Advocate for this burst is L. M. Z. Hagen (lea.zernow.hagen AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN 18913 table
GRB_name GRB160121A
GCN_number 18913
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18913 SUBJECT: GRB 160121A: MASTER-Amur observations DATE: 16/01/21 14:21:03 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik Kislovodsk Solar Station of the Pulkovo Observatory D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB160121A (Hagen et al GCN 18912) 22 sec after notice time and 34 sec after trigger time at 2016-01-21 13:51:15 UT. On our first (10s exposure) set we haven't found optical transient within SWIFT. The 5-sigma upper limit has been about 15.3 mag The message may be cited.
GCN 18917 table
GRB_name GRB160121A
GCN_number 18917
Detection_method Optical
ra 109.0882°
decl -23.5921°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18917 SUBJECT: GRB 160121A: 1.8m MOA optical afterglow detection DATE: 16/01/21 22:19:41 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia S. R. Oates, J. C. Tello (IAA-CSIC Granada), P. Tristram (Mt. John Univ. Observatory), I. Bond (Massey Univ.), S. Takahiro (Osaka Univ.), P. Yock (Univ. of Auckland) and A. J. Castro-Tirado (IAA-CSIC & ISA-UMA) report on behalf of a larger collaboration: We observed the field of GRB 160121A (Hagen et al., GCN 18912) with the 1.8m MOA-II telescope at Mt John University Observatory in New Zealand. A series of 60s exposures were taken with the R-band filter beginning 4.38 min (13:55:0 UT on 21-01-2016) after the Swift trigger 671231. We detect a single source at the edge of the Swift-XRT error circle (Hagen et al., GCN 18912), which we propose is the afterglow, at coordinates: RA (J2000) = 07:16:21.16 Dec (J2000) = -23:35:31.6 with an error of around 0.5". In the first exposure, ~292s after the trigger, we measure R ~19.7+\-0.2. The light curve appears to increase slightly in brightness, plateauing around 500s with a magnitude ~19. The light curve begins to decay around 1200s after the trigger. Magnitudes and upper limits are calibrated against USNO-B1 catalogue and are not corrected for the significant Galactic extinction corresponding to a reddening of E_B-V = 0.53 mag (Schlafly & Finkbeiner 2011).
GCN 18918 table
GRB_name GRB160121A
GCN_number 18918
Detection_method Swift-XRT Det
ra 109.0882°
decl -23.5922°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18918 SUBJECT: GRB 160121A: Enhanced Swift-XRT position DATE: 16/01/21 22:44:41 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 2518 s of XRT Photon Counting mode data and 3 UVOT images for GRB 160121A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 109.08819, -23.59221 which is equivalent to: RA (J2000): 07h 16m 21.17s Dec (J2000): -23d 35' 32.0" with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 18919 table
GRB_name GRB160121A
GCN_number 18919
Detection_method Swift-BAT Det
ra 109.0800°
decl -23.5900°
Circular_text TITLE: GCN CIRCULAR NUMBER: 18919 SUBJECT: GRB 160121A: Swift-BAT refined analysis DATE: 16/01/21 22:47:14 GMT FROM: Hans Krimm at NASA-GSFC T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team): Using the data set from T-239 to T+340 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160121A (trigger #671231) (Hagen, et al., GCN Circ. 18912). The BAT ground-calculated position is RA, Dec = 109.080, -23.590 deg which is RA(J2000) = 07h 16m 19.1s Dec(J2000) = -23d 35' 25.5" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%. The mask-weighted light curve shows a single peak starting at T-4 sec, peaking at T+3 sec and returning to baseline by T+14 sec. T90 (15-350 keV) is 12.0 +- 2.4 sec (estimated error including systematics). The time-averaged spectrum from T-0.03 to T+14.97 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.77 +- 0.13. The fluence in the 15-150 keV band is 6.1 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+2.76 sec in the 15-150 keV band is 1.2 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/671231/BA/
GCN 18920 table
GRB_name GRB160121A
GCN_number 18920
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18920 SUBJECT: GRB 160121A: TSHAO optical afterglow confirmation DATE: 16/01/22 00:36:48 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of a larger GRB follow-up collaboration: We observed the field of the Swift GRB 160121A (Hagen et al., GCN 18912) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory starting on Jan. 21 (UT) 16:04:44. We obtained several images in R filter. We detect afterglow (Oates et al., GCN 18917) in a combined image within center of the enhanced Swift-XRT position (Osborne et al., GCN 18918). Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err (mid, days) (s) 2016-01-21 16:04:44 0.12598 R 29*180 20.26 0.22 The photometry is based on nearby USNO-B1.0 stars. USNO-B1.0_id R2 0664-0122909 16.87 0664-0122918 16.73 0664-0122943 17.72 0664-0123015 18.03 0663-0123485 16.91
GCN 18921 table
GRB_name GRB160121A
GCN_number 18921
Detection_method GROND
Circular_text TITLE: GCN CIRCULAR NUMBER: 18921 SUBJECT: GRB 160121A: GROND Afterglow observations DATE: 16/01/22 08:36:42 GMT FROM: Corentin Delvaux at MPE C. Delvaux (MPE Garching), S. Schmidl (TLS Tautenburg), and J. Greiner (MPE Garching) report on behalf of the GROND team: We observed the field of GRB 160121A (Swift trigger 671231; Hagen et al., GCN #18912) 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 04:09 UT on 22-01-2016, 14.3hrs after the GRB trigger. They were performed at an average seeing of 0.9" and at an average airmass of 1.0. We clearly detect the afterglow at the position reported by Oates et al. (GCN#18917) and Mazaeva et al. (GCN#18920). Based on the first 72 min of total exposures in g'r'i'z' and 60 min in JHK, at a midtime of 04:49 UT, we estimate preliminary magnitudes and upper limits (all in AB system) of g' = 22.6 +/- 0.1 mag r' = 21.2 +/- 0.1 mag, i' = 21.1 +/- 0.1 mag, z' = 21.0 +/- 0.1 mag, J = 19.6 +/- 0.1 mag, H = 19.3 +/- 0.1 mag, K > 19.1 mag. The given magnitudes and limits are derived based on calibrating the images against GROND zeropoints and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.53 in the direction of the burst (Schlafly and Finkbeiner 2011).
GCN 18922 table
GRB_name GRB160121A
GCN_number 18922
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18922 SUBJECT: GRB 160121A: Swift/UVOT Upper Limits DATE: 16/01/22 09:26:13 GMT FROM: Samantha Oates at MSSL S. R. Oates (IAA-CSIC/UCL-MSSL) and L. M. Z. Hagen (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160121A 152 s after the BAT trigger (Hagen et al., GCN Circ. 18912). No optical afterglow consistent with the optical position reported by MOA (Oates et al., GCN Circ. 18917) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag u_FC 152 401 246 >19.7 v 435 830 78 >18.6 u 152 918 356 >19.9 w1 484 754 58 >18.3 m2 459 854 78 >18.4 w2 410 805 78 >18.5 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.53 in the direction of the burst (Schlafly and Finkbeiner 2011).
GCN 18923 table
GRB_name GRB160121A
GCN_number 18923
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18923 SUBJECT: GRB 160121A: Swift-XRT refined Analysis DATE: 16/01/22 13:31:33 GMT FROM: Phil Evans at U of Leicester P. D'Avanzo (INAF-OAB), T.G.R. Roegiers (PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA) and L.M.Z. Hagen report on behalf of the Swift-XRT team: We have analysed 7.7 ks of XRT data for GRB 160121A (Hagen et al. GCN Circ. 18912), from 75 s to 46.0 ks after the BAT trigger. The data comprise 80 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 18918). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.9 (+0.8, -0.4). At T+209 s the decay flattens to an alpha of 0.31 (+/-0.07) before breaking again at T+20.7 ks to a final decay with index alpha=2.1 (+1.6, -1.2). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+0.24, -0.18). The best-fitting absorption column is 5.8 (+1.6, -0.5) x 10^21 cm^-2, consistent with the Galactic value of 5.3 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (7.0 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 5.8 (+1.6, -0.5) x 10^21 cm^-2 Galactic foreground: 5.3 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 2.00 (+0.24, -0.18) If the light curve continues to decay with a power-law decay index of 2.1, the count rate at T+24 hours will be 3.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.3 x 10^-13 (2.1 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00671231. This circular is an official product of the Swift-XRT team.
GCN 18924 table
GRB_name GRB160121A
GCN_number 18924
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 18924 SUBJECT: GRB 160121A: RATIR Optical Observations DATE: 16/01/22 18:19:22 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160121A (Hagen et al., GCN Circular 18912) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2016/01 22.13 to 2016/01 22.29 UTC (13.28 to 17.14 hours after the BAT trigger), obtaining a total of 2.92 hours exposure in the r, i, and z bands. We detect a source at 07:16:21.16 -23:35:31.5 J2000 (0.5 arcsec), consistent with the enhanced Swift-XRT position (Osborne et al., GCN Circular 18918). In comparison with the USNO-B1 and 2MASS catalogs, we obtain the following magnitudes and 3-sigma upper limits: r = 21.73 0.13 i = 21.10 0.08 z > 19.80 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. Our observations have almost the same midpoint as the GROND observations reported by Delvaux et al. (GCN Circular 18921). The i band observations are consistent, but our r band measurement is surprisingly 0.6 mag fainter than theirs. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 18925 table
GRB_name GRB160121A
GCN_number 18925
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18925 SUBJECT: GRB 160121A: redshift from the 10.4m GTC DATE: 16/01/22 22:08:42 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia R. Sanchez-Ramirez, S. R. Oates, J. C. Tello (IAA-CSIC Granada), S. Geier (GRANTECAN), P. Tristam (Mt. John Univ. Observatory) and A. J. Castro-Tirado (IAA-CSIC and ISA-UMA) report on behalf of a larger collaboration: We observed the field of GRB 160121A (Hagen et al. GCN 18912) with the 10.4m GTC telescope (+OSIRIS) at La Palma. 6x900s spectra were taken at the position of the optical afterglow, detected by the 1.8m MOA (Oates et al. GCNC 18917), starting at 22:30 UT (i.e. 8.7 h post-burst). We identify Mg II and several Fe-II absorption lines at z = 1.960 which we propose to be the host galaxy redshift. An intervening system at z = 1.645 is also detected.
GCN 18933 table
GRB_name GRB160121A
GCN_number 18933
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 18933 SUBJECT: GRB 160121A: TSHAO optical observation DATE: 16/01/24 21:29:54 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), I. Reva (Fesenkov Astrophysical Institute), A. Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of a larger GRB follow-up collaboration: We observed the field of the Swift GRB 160121A (Hagen et al., GCN 18912) with Zeiss-1000 (East) 1-m telescope of Tien Shan Astronomical Observatory starting on Jan. 22 (UT) 16:17:07. We obtained several images in R filter. We do not detect afterglow (Oates et al., GCN 18917; Mazaeva et al., GCN 18920) in a combined image. Preliminary upper limit is following Date UT start t-T0 Filter Exp. OT UL (3 sigma) (mid, days) (s) 2015-01-22 16:17:07 1.13572 R 30*180 n/d 21.2 The photometry is based on nearby USNO-B1.0 stars (see GCN 18920).
GCN 18935 table
GRB_name GRB160121A
GCN_number 18935
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 18935 SUBJECT: GRB 160121A: RATIR Optical Observations DATE: 16/01/25 18:37:38 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160121A (Hagen et al., GCN Circular 18912) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2016/01 24.13 to 2016/01 24.42 UTC (61.29 to 68.12 hours after the BAT trigger), obtaining a total of 4.27 hours exposure in the r, i and z bands. We no longer detect the source previously reported by Watson et al. (GCN Circular 18924). In comparison with the USNO-B1 and 2MASS catalogs, we obtain the following 3-sigma upper limits: r > 22.97 i > 22.94 z > 20.10 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.