GRB150323C

This page lists all entries on GRB150323C in GRBweb

Summary Fermi GBM IPN Swift GCN 17621 GCN 17622 GCN 17624 GCN 17625 GCN 17627 GCN 17629 GCN 17630 GCN 17631 GCN 17632 GCN 17633 GCN 17635 GCN 17637 GCN 17639 GCN 17644 GCN 17646 GCN 17648 GCN 17655 GCN 17669 GCN 17670 GCN 17671

Summary table
Variable Value Source
GRB_name_Fermi GRB150323712
T0 17:04:55.302 UTC Fermi_GBM
ra 192.6169° Swift
decl 50.1912° Swift
pos_error 2.07e-04° Swift
T90 43.264 s Fermi_GBM
T90_error 2.429 s Fermi_GBM
T90_start 17:04:55.302 UTC Fermi_GBM
fluence 1.88e-06 erg/cm² Fermi_GBM
fluence_error 2.82e-08 erg/cm² Fermi_GBM
T100 185.098 s
GBM_located False
mjd 57104.711751180555 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB150323712
trigger_name bn150323712
ra 192.6129°
decl 50.1981°
pos_error 6.42e+00°
datum 2015-03-23
t_trigger 17:05:09.638 UTC
T90 43.264 s
T90_error 2.429 s
T90_start 17:04:55.302 UTC
fluence 1.88e-06 erg/cm²
fluence_error 2.82e-08 erg/cm²
flux_1024 1.64e+00 erg/cm²/s
flux_1024_error 2.01e-01 erg/cm²/s
flux_1024_time -1.22e+00 erg/cm²/s
flux_64 3.27e+00 erg/cm²/s
flux_64_error 1.13e+00 erg/cm²/s
IPN table
GRB_name GRB150323C
ra 192.6125°
decl 50.2000°
pos_error 5.00e-02°
Swift table
GRB_name GRB150323C
t_trigger 17:05:21 UTC
ra 192.6169°
decl 50.1912°
pos_error 2.07e-04°
T90 159.4 s
fluence 1.30e-06 erg/cm²
GCN 17621 table
GRB_name GRB150323C
GCN_number 17621
Detection_method Swift Det
t_trigger 17:05:21 UTC
ra 192.6130°
decl 50.1980°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17621 SUBJECT: GRB 150323C: Swift detection of a burst DATE: 15/03/23 17:15:23 GMT FROM: David Palmer at LANL A. Amaral-Rogers (U Leicester), W. H. Baumgartner (GSFC/UMBC), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester), D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf of the Swift Team: At 17:05:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 150323C (trigger=636005). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 192.613, +50.198 which is RA(J2000) = 12h 50m 27s Dec(J2000) = +50d 11' 54" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 40 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger. The XRT began observing the field at 17:08:11.3 UT, 169.8 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 192.6177, 50.1910 which is equivalent to: RA(J2000) = +12h 50m 28.25s Dec(J2000) = +50d 11' 27.6" with an uncertainty of 5.2 arcseconds (radius, 90% containment). This location is 27 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. UVOT took a finding chart exposure of 150 seconds with the White filter starting 178 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01. Burst Advocate for this burst is A. Amaral-Rogers (aar14 AT le.ac.uk). 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 17622 table
GRB_name GRB150323C
GCN_number 17622
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17622 SUBJECT: GRB 150323C: MASTER-net optical observation DATE: 15/03/23 17:22:58 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University V.Krushinsky, I.Zalozhnih, A. Popov Ural Federal University, Yekaterinburg, Kourovka V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo 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) D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the GRB150323C 42 sec after notice time and 88 sec after trigger time at 2015-03-23 17:09:39 UT in two polarizations. On our first (20s exposure) set we haven't found optical transient within SWIFT error-box (Amaral-Rogers et al. GCN17621). The 5-sigma upper limit has been about 17.6 mag MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Ural was pointed to the GRB150323C 35 after notice time and 79 sec after trigger time at 2015-03-23 17:09:31 UT in two polarizations. On our first (20s exposure) set we haven't found optical transient within SWIFT error-box (ra=12 50 28 dec=+50 11 25 r=0.001400). The 5-sigma upper limit has been about 17.9 mag The message may be cited.
GCN 17624 table
GRB_name GRB150323C
GCN_number 17624
Detection_method Swift-XRT Other
ra 192.6169°
decl 50.1918°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17624 SUBJECT: GRB 150323C: Prompt enhanced Swift-XRT position DATE: 15/03/23 17:48:13 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using promptly downlinked XRT event data for GRB 150323C, we find an enhanced XRT position of the afterglow: RA, Dec: 192.6169, 50.1918 which is equivalent to: RA (J2000) = 12 50 28.05 Dec (J2000) = +50 11 30.4 with an uncertainty of 2.1 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/636005. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 17625 table
GRB_name GRB150323C
GCN_number 17625
Detection_method Optical
ra 192.6163°
decl 50.1913°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17625 SUBJECT: GRB 150323C: Nanshan optical afterglow detection DATE: 15/03/23 18:10:39 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI), H.-B. Niu, J.-Z. Liu, G.-X. Pu, A. Esamdin, L. Ma (XAO) report: We observed the field of GRB 150323C (Amaral-Rogers et al., GCN 17621) using the 1m telescope at Nanshan, Xinjiang, China. Observations were carried out in R-band, starting at 17:19:50 UT on 2015-03-23, i.e., 869 s after the burst. A source, not present in SDSS and DSS, is well detected in individual images at coordinates RA(J2000) = 12:50:27.92 Dec(J2000) = +50:11:28.75 with an uncertainty of ~ 1 arcsec, being consistent with the enhanced Swift-XRT position (Evans, GCN 17624). We thus think it's the optical afterglow of the burst, and it has m(R) = 21.3 +/- 0.2 at a median time of 1344s post-burst, calibrated with the SDSS field.
GCN 17627 table
GRB_name GRB150323C
GCN_number 17627
Detection_method Fermi GBM Det
t_trigger 17:05:09.640 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 17627 SUBJECT: GRB150323C: Fermi GBM detection DATE: 15/03/24 00:25:37 GMT FROM: Matthew Stanbro at UAH/Fermi Matthew Stanbro (UAH) reports on behalf of the Fermi GBM Team: "At 17:05:09.64 UT on 23 March 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150323C (trigger 448823112 / 150323712) which was also detected by the Swift/BAT (Amaral-Rogers et al. 2015, GCN 17621) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 58 degrees. The GBM light curve consists of several episodes with a duration (T90) of about 43 s (50-300 keV). The time-averaged spectrum from T0-10.24 s to T0+30.72 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.15 +/- 0.16 and the cutoff energy, parameterized as Epeak, is 107 +/- 18 keV. The event fluence (10-1000 keV) in this time interval is (2.50 +/- 0.19)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-1.22 s in the 8-1000 keV band is 1.64 +/- 0.20 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN 17629 table
GRB_name GRB150323C
GCN_number 17629
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17629 SUBJECT: GRB 150323C: Xingming upper limit DATE: 15/03/24 04:09:25 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK/NBI), X. Gao (Urumqi No.1 Senior High School, Xinjiang), and Z.-J. Xu (Nanjing Putian Telecommunications Co. Ltd., Jiangsu) report: We observed the field of GRB 150323C (Amaral-Rogers et al., GCN 17621) using the 0.35m robotic Xingming telescope located at Nanshan, Xinjiang, China. Observations started at 17:08:06 UT on 2015-03-23, i.e., 165 s after the burst, and a series of 40s, 60s, and 90s unfiltered exposures were obtained. No optical source is detected at the enhanced Swift-XRT position (Evans, GCN 17624), down to a limiting magnitude of ~19.2 mag since the starting of our observations.
GCN 17630 table
GRB_name GRB150323C
GCN_number 17630
Detection_method Swift-XRT Other
ra 192.6169°
decl 50.1918°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17630 SUBJECT: GRB 150323C: Swift-XRT refined Analysis DATE: 15/03/24 05:15:04 GMT FROM: Phil Evans at U of Leicester V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), A. Maselli (INAF-IASFPA) and A. Amaral-Rogers report on behalf of the Swift-XRT team: We have analysed 6.1 ks of XRT data for GRB 150323C (Amaral-Rogers et al. GCN Circ. 17621), from 160 s to 12.6 ks after the BAT trigger. The data comprise 312 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 best available XRT position (using the promptly downlinked event data, the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue) is RA, Dec = 192.6169, 50.1918 which is equivalent to: RA (J2000): 12 50 28.05 Dec(J2000): +50 11 30.4 with an uncertainty of 2.1 arcsec (radius, 90% confidence). The late-time light curve (from T0+5.1 ks) can be modelled with a power-law decay with a decay index of alpha=1.0 (+/-0.5). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.34 (+/-0.05). The best-fitting absorption column is 1.55 (+0.13, -0.12) x 10^21 cm^-2, in excess of the Galactic value of 1.2 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.52 (+0.25, -0.23) and a best-fitting absorption column of 6.5 (+4.5, -3.9) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.7 x 10^-11 (3.5 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.5 (+4.5, -3.9) x 10^20 cm^-2 Galactic foreground: 1.2 x 10^20 cm^-2 Excess significance: 2.2 sigma Photon index: 2.52 (+0.25, -0.23) If the light curve continues to decay with a power-law decay index of 1.0, the count rate at T+24 hours will be 3.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.8 x 10^-14 (1.3 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/00636005. This circular is an official product of the Swift-XRT team.
GCN 17631 table
GRB_name GRB150323C
GCN_number 17631
Detection_method Optical
ra 252.6083°
decl 50.1967°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17631 SUBJECT: GRB 150323C : Xinglong TNT optical observation DATE: 15/03/24 05:34:21 GMT FROM: L.P. Xin at NAOC L. P. Xin, X. F. Wang, J. Y. Wei, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han and C. Wu on behalf of EAFON report: We began to observe GRB 150323C (Amaral-Rogers et al., GCN 17621) with Xinglong 0.8-m TNT telescope at 2015-03-23, 17:07:27(UT), about 126 sec after the Swift trigger time. The new source within XRT circle (Amaral-Rogers et al., GCN 17621 ) reported by Xu et al., ( GCN 17625 ) was clearly detected in our coadded images. Preliminary analysis shows that the brightness of this optical transient in R band is rising from 21.6 to 20.2 and then decaying, indicating that this source is the optical afterglow of the burst. All the magnitudes are calibrated by a nearby USNO B1.0 object ( RA: 16:50:26 DEC: 50:11:48, R2=16.47mag ). The message may be cited.
GCN 17632 table
GRB_name GRB150323C
GCN_number 17632
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17632 SUBJECT: GRB 150323C: RATIR Optical Afterglow Observations DATE: 15/03/24 06:49:44 GMT FROM: Owen Littlejohns at Az State U Alan M. Watson (UNAM), Owen Littlejohns (ASU), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (ORAU/GSFC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 150323C (Amaral-Rogers, et al., GCN 17621) 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 2015/03 24.14 to 2015/03 24.27 UTC (10.20 to 13.42 hours after the BAT trigger), obtaining a total of 2.49 hours exposure in the r, i and z bands. For a source within the Swift-XRT error circle (D'Elia, et al., GCN 17630), in comparison with the SDSS DR9, we obtain the following detections and upper limit (3-sigma): r 23.00 +/- 0.15 i 22.63 +/- 0.11 z > 20.61 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. In comparison to an earlier epoch of observations (Xin, et al., GCN 17631) we find this magnitude to be consistent with a power-law decay with an approximate temporal decay index alpha = 0.5. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 17633 table
GRB_name GRB150323C
GCN_number 17633
Detection_method Swift-XRT Det
ra 192.6169°
decl 50.1912°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17633 SUBJECT: GRB 150323C: Enhanced Swift-XRT position DATE: 15/03/24 09:02:46 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 5836 s of XRT Photon Counting mode data and 7 UVOT images for GRB 150323C, 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 = 192.61686, +50.19121 which is equivalent to: RA (J2000): 12h 50m 28.05s Dec (J2000): +50d 11' 28.4" 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 17635 table
GRB_name GRB150323C
GCN_number 17635
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17635 SUBJECT: GRB 150323C: Swift/UVOT Upper Limits DATE: 15/03/24 12:55:50 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and A. Amaral-Rogers (U Leicester) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 150323C 179 s after the BAT trigger (Amaral-Rogers et al., GCN Circ. 17621). No optical afterglow consistent with the optical position (Xu et al. GCN Circ. 17625) 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 white_FC 179 328 147 >21.5 u_FC 337 587 246 >20.7 white 179 11759 1513 >22.4 v 669 12698 555 >21.0 b 594 7661 444 >21.1 u 337 7541 717 >21.0 w1 718 7337 432 >21.2 m2 5494 7131 393 >20.6 w2 5084 12665 1279 >22.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN 17637 table
GRB_name GRB150323C
GCN_number 17637
Detection_method Swift-BAT Det
ra 192.6250°
decl 50.1650°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17637 SUBJECT: GRB 150323C, Swift-BAT refined analysis DATE: 15/03/24 20:28:56 GMT FROM: Amy Lien at GSFC D. M. Palmer (LANL), Amaral-Rogers (U Leicester), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-274 to T+800 sec from the recent telemetry downlink, we report further analysis of BAT GRB 150323C (trigger #636005) (Amaral-Rogers, et al., GCN Circ. 17621). The BAT ground-calculated position is RA, Dec = 192.625, 50.165 deg which is RA(J2000) = 12h 50m 30.1s Dec(J2000) = +50d 09' 55.3" with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%. The mask-weighted light curve shows several weak overlapping pulses. The main burst structure starts at ~ T-20 s and ends at ~T+20 s, followed by another weaker pulse lasting till ~ T+160 s. T90 (15-350 keV) is 159.4 +- 54.0 sec (estimated error including systematics). The time-averaged spectrum from T-22.9 to T+166.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.09 +- 0.32. The fluence in the 15-150 keV band is 1.3 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+5.98 sec in the 15-150 keV band is 1.1 +- 0.3 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/636005/BA/
GCN 17639 table
GRB_name GRB150323C
GCN_number 17639
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17639 SUBJECT: GRB 150323C: Mondy optical observations DATE: 15/03/25 13:29:01 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the GRB 150323C (Amaral-Rogers et al., GCN 17621) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Mar., 23 (UT) 11:42:02. We obtained several images in R-filter of 120 s exposure. Within enhanced Swift-XRT error circle (Osborne et al., GCN 17633) we clearly detect optical afterglow (Xu et al. GCN 17625, Xin et al. GCN 17631; Watson et al. GCN 17632) in a combined image. Preliminary photometry of the afterglow is following Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2015-03-24 15:14:09 0.95405 R 44*120 22.4 0.3 Photometry is based on SDSS DR9 stars: SDSS9_id R(Lupton) J125023.08+501048.2 16.84 J125032.04+501021.5 18.37 J125016.28+501035.8 18.22
GCN 17644 table
GRB_name GRB150323C
GCN_number 17644
Detection_method Optical
ra 192.6163°
decl 50.1913°
Circular_text TITLE: GCN CIRCULAR NUMBER: 17644 SUBJECT: Subject: GRB 150323C; Konkoly optical observations DATE: 15/03/25 21:02:06 GMT FROM: Janos Kelemen at Konkoly Obs/Hungary J. Kelemen (kelemen at konkoly.hu) on behalf of the GRB OT observing program at the Konkoly Observatory. Starting on the night 23/03/2015 we observed the field GRB 150323C (A. Amaral-Rogers et al. GCN 17621 ). On the position reported by D. Xu et al. (GCN 17625) according our coadded R images we confirmed the presence of a marginal optical source in R band. Position from D. Xu our work --------------------------------------------------------------- RA(J2000) = 12:50:27.92 RA: 12:50:28.02 Dec(J2000) = +50:11:28.75 DEC: 50:11:28.3 Photometric results: (Based on nearby USNO-B1.0 stars) time from GRB. exp filter Mag. ------------------------------------------------ 10653 s. 1800 s R 21.7 +/-0.18 ------------------------------------------------
GCN 17646 table
GRB_name GRB150323C
GCN_number 17646
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 17646 SUBJECT: GRB 150323C: MITSuME Akeno Optical observation DATE: 15/03/26 14:10:07 GMT FROM: Taketoshi Yoshii at Tokyo Tech T.Fujiwara, Y. Saito, T. Yoshii, Y. Tachibana, H. Ohuchi, Y. Yano, S.Kurita, Y. Ono, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 150323C (Amaral-Rogers et al. GCN Circular #17621) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started at 2015-03-23 17:06:46 UT (85 sec after the burst). We detected the previously reported optical afterglow (Xu et al. GCN Circular #17625) in the Rc band. The measured magnitudes are listed below. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ---------------------------------------------------------------------- 85 17:09:24 270 > 19.9 > 19.6 > 18.5 1069 17:34:06 1200 > 20.9 20.3 $B!^(B 0.5 > 19.5 6681 19:18:53 2400 > 20.4 > 20.4 > 19.4 ---------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.
GCN 17648 table
GRB_name GRB150323C
GCN_number 17648
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 17648 SUBJECT: GRB 150323C: Nishi-Harima NIR Observations DATE: 15/03/26 19:33:31 GMT FROM: Taketoshi Yoshii at Tokyo Tech S. Honda. J. Takahashi, Y. Takagi, K. Morihana, Y. Itoh (Univ. of Hyogo), and Y. Saito (Tokyo Tech) report on behalf of Nayuta team and OISTER collaboration: We observed the field of GRB 150323C (Amaral-Rogers et al., GCN 17621) with Nishiharima Infrared Camera (NIC) attached to the Nayuta 2-m telescope at the Nishi-Harima Astronomical Observatory. The observations were started at 17:30 UT on 2015-03-23. We detected the near-infrared afterglow in J, H and Ks bands. Photometric results of our observations are shown below. We used 2MASS 12502614+5011480, 12502605+5011289, 12503202+5010217, and 12503649+5012012 as reference stars for photometry. # MID-UT Tmid-T0 T-EXP J_mag H_mag Ks_mag -------------------------------------------------------------------------------- 17:33:16 28 1200 18.22 +/- 0.10 17.25 +/- 0.10 16.44 +/- 0.13 17:59:27 54 1200 18.68 +/- 0.11 17.59 +/- 0.11 16.94 +/- 0.14 18:25:32 80 1200 19.40 +/- 0.20 17.77 +/- 0.13 17.23 +/- 0.14 --------------------------------------------------------------------------------- Tmid-T0: Elapsed time after the burst (minutes) T-EXP: Total Exposure time (seconds)
GCN 17655 table
GRB_name GRB150323C
GCN_number 17655
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17655 SUBJECT: GRB 150323C: possible host galaxy detection DATE: 15/03/29 20:03:27 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani (DARK/NBI), Dong Xu (DARK/NBI), Pall Jakobsson (Univ. Iceland) and Jussi Harmanen (NOT and Univ. Turku) report on behalf of a larger collaboration: We observed the field of GRB 150323C (Amaral-Rogers et al., GCN 17621; Stanbro, GCN 17627) using the Nordic Optical Telescope (NOT) located in La Palma. The mean time of the observation was March 28.21 UT, that is 4.49 days after the GRB. A 20 min exposure was collected using the SDSS r filter. Close to the position of the optical afterglow (Xu et al., GCN 17625; Watson et al., GCN 17632), we detect an object with r = 23.6 +- 0.2 AB (calibrated against nearby SDSS stars). This source is also marginally detected in the archival SDSS images with a comparable (though uncertain) brightness, and therefore an underlying galaxy must be contributing a significant fraction of the light. We note a small, but significant offset between the afterglow and the galaxy positions. By registering astrometrically the afterglow image by Xu et al. (GCN 17625) with the new NOT data, we find an offset of approximately 0.65". Such an offset is not unprecedented, so that the SDSS/NOT object is still a viable host galaxy candidate for GRB 150323C. [GCN OPS NOTE(30mar15): Per author's request, JH's affiliation was changed.]
GCN 17669 table
GRB_name GRB150323C
GCN_number 17669
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17669 SUBJECT: GRB 150323C: Khureltogot optical observations DATE: 15/04/04 11:07:51 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the GRB 150323C (Amaral-Rogers et al., GCN 17621) with ORI-40 telescope of Khureltogot observatory starting on Mar., 23 (UT) 17:20:51, i.e. ~15 minutes after burst trigger. We obtained 180 unfiltered images of 60 s exposure. Within enhanced Swift-XRT error circle (Osborne et al., GCN 17633) we detect optical afterglow (Xu et al. GCN 17625, Xin et al. GCN 17631; Watson et al. GCN 17632). Preliminary photometry of the afterglow in combined images is following Date UT start t-T0 Filter Exp. OT OT_err (mid, days) (s) 2015-01-23 17:20:51 0.01449 none 10*60 21.1 0.3 2015-01-23 17:31:40 0.02199 none 10*60 20.5 0.25 2015-01-23 17:42:28 0.02950 none 10*60 20.8 0.25 2015-01-23 17:53:17 0.03700 none 10*60 20.2 0.2 2015-01-23 18:04:04 0.04451 none 10*60 20.0 0.2 2015-01-23 18:14:54 0.06199 none 35*60 21.3 0.3 2015-01-23 18:54:26 0.09409 none 39*60 21.0 0.3 2015-01-23 19:57:04 0.13649 none 40*60 21.5 0.4 Photometry is based on SDSS DR9 stars: SDSS9_id R(Lupton) J125026.13+501147.9 16.16 J125023.08+501048.2 16.84 Our photometry confirms non-monotonic behaiviour of a lighr curve of the afterglow mentioned by Xin et al. (GCN 17631). The light curve of GRB 150323C afterglow can be found in http://grb.rssi.ru/GRB150323C/GRB150323C_ORI40_lc.png
GCN 17670 table
GRB_name GRB150323C
GCN_number 17670
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17670 SUBJECT: GRB 150323C: additional optical observations in Mondy DATE: 15/04/04 11:16:29 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), A. Volnova (IKI), E. Klunko (ISTP), I. Korobtsev (ISTP), M. Eselevich (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We additionally observed the field of the GRB 150323C (Amaral-Rogers et al., GCN 17621) with AZT-33IK telescope of Sayan observatory (Mondy) on Mar., 27 and Mar. 30 under good weather conditions and mean FWHV of 1.8 arcsec. We obtained several images in R-filter of 120 s exposure. In both epochs we detect a source in coordinates (J2000) 12 50 27.90 +50 11 29.0 (+/- 0.45" ) which is within afterglow coordinates (Xu et al., GCN 17625) and within the enhanced Swift-XRT position (Osborne et al., GCN 17633). Our object is apparently the same object suggested as a possible host galaxy (Malesani et al., GCN 17655). Preliminary photometry of the source is following Date UT start t-T0 Filter Exp. OT Err. (mid, days) (s) 2015-03-27 18:22:30 4.11333 R 85*120 22.7 0.25 2015-03-30 14:09:29 7.02068 R 194*120 22.3 0.15 Photometry is based on SDSS DR9 stars: SDSS9_id R(Lupton) J125023.08+501048.2 16.84 J125032.04+501021.5 18.37 Also we note that our photometry reported early (Mazaeva et al., GCN 17639) may by significantly be significantly influenced by the possible host galaxy.
GCN 17671 table
GRB_name GRB150323C
GCN_number 17671
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 17671 SUBJECT: GRB 150323C: CrAO optical observations DATE: 15/04/04 11:23:31 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev (CrAO), K. Antoniuk (CrAO), E. Mazaeva (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the GRB 150323C (Amaral-Rogers et al., GCN 17621) with AZT-11 telescope of CrAO observatory starting on Mar. 23 (UT) 20:09:58. We obtained ages in R-filter of 180 s exposure under non-optimal weather conditions and mean FWHM of about 4.7 arcsec. In the enhanced XRT position (Osborne et al., GCN 17633) we do not detect any object. In particular we do no detect optical afterglow (Xu et al. GCN 17625, Xin et al. GCN 17631; Watson et al. GCN 17632). An upper limit is following Date UT start, t-t0 Filter Exp. OT UL (3 sigma) (mid, days) (s) 2015-03-23 20:09:58 0.14949 R 20*180 n/d 21.0 The photometry is based on nearby USNO-B1.0 stars.