GRB121028A

This page lists all entries on GRB121028A in GRBweb

Summary IPN Swift GCN 13913 GCN 13914 GCN 13915 GCN 13917 GCN 13918 GCN 13919 GCN 13924 GCN 13927 GCN 13950

Summary table
Variable Value Source
T0 5:04:31 UTC GCN_circulars,Swift Det
ra 271.8995° Swift
decl -2.2936° Swift
pos_error 2.20e-04° Swift
T90 3.8 s Swift
T90_start 5:04:31 UTC Swift
fluence 3.70e-07 erg/cm² Swift
T100 3.8 s
GBM_located False
mjd 56228.21146990741 GCN_circulars,Swift Det
IPN table
GRB_name GRB121028A
ra 271.9250°
decl -2.2833°
pos_error 5.00e-02°
Swift table
GRB_name GRB121028A
t_trigger 5:04:31 UTC
ra 271.8995°
decl -2.2936°
pos_error 2.20e-04°
T90 3.8 s
fluence 3.70e-07 erg/cm²
GCN 13913 table
GRB_name GRB121028A
GCN_number 13913
Detection_method Swift Det
t_trigger 5:04:31 UTC
ra 271.9230°
decl -2.2850°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13913 SUBJECT: GRB 121028A: Swift detection of a burst DATE: 12/10/28 05:31:03 GMT FROM: David Palmer at LANL R. L. C. Starling (U Leicester), C. Gronwall (PSU), H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester), D. M. Palmer (LANL), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 05:04:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 121028A (trigger=536897). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 271.923, -2.285 which is RA(J2000) = 18h 07m 42s Dec(J2000) = -02d 17' 04" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 30 sec. The peak count rate was ~2500 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 05:06:41.7 UT, 129.8 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 271.8995, -2.2936 which is equivalent to: RA(J2000) = 18h 07m 35.89s Dec(J2000) = -02d 17' 36.8" with an uncertainty of 2.3 arcseconds (radius, 90% containment). This location is 90 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. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.48 x 10^21 cm^-2, Kalberla et al. 2005), with an excess column of 4.4 (+4.35/-3.23) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 134 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 19.2 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 18.0 mag. No correction has been made for extinction. Due to the maintenance work at Goddard this weekend (GCN 13905) there may be a delay in receiving the full dataset, and thus refined analyses may not be available until late Sunday/early Monday. Burst Advocate for this burst is R. L. C. Starling (rlcs1 AT star.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 13914 table
GRB_name GRB121028A
GCN_number 13914
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13914 SUBJECT: GRB 121028A: Faulkes Telescope North observations DATE: 12/10/28 08:12:16 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), A. Gomboc (U. Ljubljana), on behalf of a large collaboration report: The 2-m Faulkes Telescope North automatically began observing GRB 121028A (Starling et al. GCN Circ. 13913) on October 28 2012, 05:07:12 UT corresponding to 161 seconds post burst trigger with BVRi' filters. Within the XRT error circle we don't see any uncatalogued object down to the following limits: Mid time from Exposure Filter Limit GRB (sec) (s) ------------------------------------------------------- 198 3x10 R > 19 535 10 i' > 18 ------------------------------------------------------- Magnitudes are calibrated against nearby USNOB1 stars.
GCN 13915 table
GRB_name GRB121028A
GCN_number 13915
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13915 SUBJECT: GRB 121028A: MITSuME Okayama Optical upper limits DATE: 12/10/28 13:05:18 GMT FROM: Daisuke Kuroda at OAO/NAOJ D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ), S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto) and N. Kawai(Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 121028A (Starling et al., GCNC 13913) with the optical three color (g', Rc and Ic) CCD camera attached to the MITSuME 50cm telescope of Okayama Astrophysical Observatory. The observation started on 2012-10-28 09:15:55 UT (~4.2 h after the burst). We did not find any new point source within the XRT circle (Starling et al., GCNC 13913) in all the three bands. Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.21623 10:15:53 6360.0 >19.7 >19.4 >18.7 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 13917 table
GRB_name GRB121028A
GCN_number 13917
Detection_method Swift-BAT Det
ra 271.9030°
decl -2.2980°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13917 SUBJECT: GRB 121028A: Swift-BAT refined analysis DATE: 12/10/29 00:53:25 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (GSFC/UMBC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), A. M. Parsons (GSFC), G. Sato (ISAS), M. Stamatikos (OSU), R. L. C. Starling (U Leicester), J. Tueller (GSFC), T. N. Ukwatta (GWU) (i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from recent telemetry downlinks, we report further analysis of BAT GRB 121028A (trigger #536897) (Starling, et al., GCN Circ. 13913). The BAT ground-calculated position is RA, Dec = 271.903, -2.298 deg, which is RA(J2000) = 18h 07m 36.7s Dec(J2000) = -02d 17' 52.1" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%. The mask-weighted light curve shows a single pulse starting at ~T-0.9 sec, peaking at ~T+2 sec, and ending ~T+4 sec. T90 (15-350 keV) is 3.8 +- 0.7 sec (estimated error including systematics). The time-averaged spectrum from T-0.8 to T+3.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.79 +- 0.17. The fluence in the 15-150 keV band is 3.7 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.01 sec in the 15-150 keV band is 1.9 +- 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/536897/BA/
GCN 13918 table
GRB_name GRB121028A
GCN_number 13918
Detection_method Swift-XRT Det
ra 271.8995°
decl -2.2936°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13918 SUBJECT: GRB 121028A: Enhanced Swift-XRT position DATE: 12/10/29 07:15:58 GMT FROM: Phil Evans at U of Leicester P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team. Using 2614 s of XRT Photon Counting mode data and 3 UVOT images for GRB 121028A, 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 = 271.89948, -2.29358 which is equivalent to: RA (J2000): 18h 07m 35.87s Dec (J2000): -02d 17' 36.9" with an uncertainty of 1.7 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 13919 table
GRB_name GRB121028A
GCN_number 13919
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13919 SUBJECT: GRB 121028A: Swift-XRT refined Analysis DATE: 12/10/29 07:39:59 GMT FROM: Kim Page at U.of Leicester K.L. Page (U. Leicester) and R. L. C. Starling (U Leicester) report on behalf of the Swift-XRT team: We have analysed 9.4 ks of XRT data for GRB 121028A (Starling et al. GCN Circ. 13913), from 139 s to 48.8 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 13918). The light curve can be modelled with a power-law decay with a decay index of alpha=0.87 (+/-0.07). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.63 (+0.26, -0.25). The best-fitting absorption column is 4.8 (+1.7, -1.4) x 10^21 cm^-2, in excess of the Galactic value of 2.5 x 10^21 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.6 x 10^-11 (7.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.8 (+1.7, -1.4) x 10^21 cm^-2 Galactic foreground: 2.5 x 10^21 cm^-2 Excess significance: 2.6 sigma Photon index: 1.63 (+0.26, -0.25) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00536897. This circular is an official product of the Swift-XRT team.
GCN 13924 table
GRB_name GRB121028A
GCN_number 13924
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 13924 SUBJECT: GRB 121028A: RAPTOR Limits During Gamma-Ray Emitting Interval DATE: 12/10/29 16:05:04 GMT FROM: James Wren at LANL J. Wren, W.T. Vestrand, P. Wozniak, and H. Davis, of Los Alamos National Laboratory report: The RAPTOR network of robotic optical telescopes made observations of Swift trigger 536897 (Starling, et al., GCN 13913). The burst location was within the field of our wide-field monitor located in Maui, HI, which began a 10 s integration of the location at 05:04:32.5 UT, 0.6 s after the Swift trigger time and during the gamma-ray emitting interval including the time of peak emission detected by the BAT (Sakamoto, et al., GCN 13917). We detect no new object at the location of the refined Swift XRT location (Evans, et al., GCN 13918). Our 3-sigma limiting magnitude is 10.0 based on a comparison of our unfiltered image to the Tycho-2 V-band catalog.
GCN 13927 table
GRB_name GRB121028A
GCN_number 13927
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13927 SUBJECT: GRB 121028A: near-IR observations at Calar Alto DATE: 12/10/29 20:15:14 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia M. Jelinek, A. J. Castro-Tirado (IAA-CSIC Granada), P. Ferrero (IAC Tenerife), S. Guziy (Univ. of Nikolaev) and G. Bergond (CAHA Almera), on behalf of a larger collaboration, report: "Following the detection of GRB 121028A by Swift (Starling et al. GCNC 13913), we triggered the 3.5m CAHA telescope (+ Omega 2000) at the German-Spanish Calar Alto Observatory. Observations (900s each) were taken in the YJHK-bands, starting at 18:05 UT (i.e. 13 hr post burst). At the position of the X-ray afterglow (Evans et al. GCNC 13918), we do not detect a near-IR countepart in any band, particularly down to H = 20.5." This message can be quoted. [GCN OPS NOTE(30oct12): Per author's request, PF was added to the author list.]
GCN 13950 table
GRB_name GRB121028A
GCN_number 13950
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13950 SUBJECT: GRB 121028A: Swift/UVOT Upper Limits DATE: 12/11/05 16:58:22 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and R. L. C. Starling (U Leicester) report on behalf of the Swift/UVOT team. The Swift/UVOT began settled observations of the field of GRB 121028A 133s after the BAT trigger (Starling et al., GCN Circ. 13913). Data summed from the first and second orbits do not reveal a source at the enhanced position of the X-ray afterglow (Evans et al., GCN Circ. 13918). The 3-sigma upper limits for the finding chart (fc) and summed exposures are reported below: FILTER T_start(s) T_stop Exposure Mag/3UL ======================================================== white (fc) 133 283 147 >19.96 white 877 7754 540 >21.07 v 6528 6727 196 >18.94 b 2713 2758 44 >19.10 u 345 595 245 >19.43 u 7143 7343 196 >19.68 uvw1 6938 7138 196 >19.61 uvw2 7761 7961 196 >19.90 ======================================================= The above magnitudes are not corrected for the Galactic extinction corresponding to a reddening of E_{B-V} = 1.41 (Schlegel et al., 1998, ApJS, 500, 525). The photometry is on the UVOT photometric system described in Breeveld et al. 2011 (AIP Conf. Proc. 1358, 373)