GRB120311B

This page lists all entries on GRB120311B in GRBweb

Summary IPN Swift GCN 13038 GCN 13040 GCN 13041 GCN 13042 GCN 13044 GCN 13045 GCN 13046 GCN 13047 GCN 13050 GCN 13059

Summary table
Variable Value Source
T0 15:08:10 UTC GCN_circulars,Swift Det
ra 258.5621° Swift
decl -13.0514° Swift
pos_error 1.81e-04° Swift
T90 28.2 s Swift
T90_start 15:08:10 UTC Swift
fluence 1.00e-06 erg/cm² Swift
T100 28.2 s
GBM_located False
mjd 55997.6306712963 GCN_circulars,Swift Det
IPN table
GRB_name GRB120311B
ra 258.5000°
decl -13.0667°
pos_error 5.00e-02°
Swift table
GRB_name GRB120311B
t_trigger 15:08:10 UTC
ra 258.5621°
decl -13.0514°
pos_error 1.81e-04°
T90 28.2 s
fluence 1.00e-06 erg/cm²
GCN 13038 table
GRB_name GRB120311B
GCN_number 13038
Detection_method Swift Det
t_trigger 15:08:10 UTC
ra 258.5010°
decl -13.0600°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13038 SUBJECT: GRB 120311B: Swift detection of a burst DATE: 12/03/11 15:17:28 GMT FROM: David Palmer at LANL F. E. Marshall (NASA/GSFC), S. D. Barthelmy (GSFC), M. M. Chester (PSU), J. R. Cummings (NASA/UMBC), P. D'Avanzo (INAF-OAB), C. Guidorzi (U Ferrara), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU), E. Sonbas (NASA/GSFC/Adiyaman Univ.) and B.-B. Zhang (PSU) report on behalf of the Swift Team: At 15:08:10 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 120311B (trigger=517489). Swift did not slew immediately because of the Earth limb observing constraint. The BAT on-board calculated location is RA, Dec 258.501, -13.060 which is RA(J2000) = 17h 14m 00s Dec(J2000) = -13d 03' 34" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks structure with a duration of about 20 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~10 sec after the trigger. Due to an observing constraint, Swift will not slew until T0+49.0 minutes. There will be no XRT or UVOT data until this time. Burst Advocate for this burst is F. E. Marshall (marshall AT milkyway.gsfc.nasa.gov). 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 13040 table
GRB_name GRB120311B
GCN_number 13040
Detection_method Swift-XRT Other
ra 258.5610°
decl -13.0524°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13040 SUBJECT: GRB 120311B: Swift-XRT observations DATE: 12/03/11 17:07:00 GMT FROM: Phil Evans at U of Leicester J.P. Osborne (U. Leicester), D.N. Burrows (PSU), J.A. Kennea (PSU), G. Tagliaferri (INAF-OAB), S. Campana (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 120311B at 15:59:18.5 UT, 3067.7 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 258.56101, -13.05235 which is equivalent to: RA(J2000) = 17h 14m 14.64s Dec(J2000) = -13d 03' 08.5" with an uncertainty of 3.6 arcseconds (radius, 90% containment). This location is 212 arcseconds from the BAT onboard position. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. This position is more than 2-sigma away from the BAT position, and so possibly unrelated to the trigger. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.64 x 10^21 cm^-2 (Kalberla et al. 2005).
GCN 13041 table
GRB_name GRB120311B
GCN_number 13041
Detection_method Swift-BAT Det
ra 258.5510°
decl -13.0680°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13041 SUBJECT: GRB 120311B: Swift-BAT refined analysis DATE: 12/03/11 21:31:25 GMT FROM: Scott Barthelmy at NASA/GSFC T. N. Ukwatta (MSU), 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), F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC) (i.e. the Swift-BAT team): Using the data set from T-120 to T+258 sec from recent telemetry downlinks, we report further analysis of BAT GRB 120311B (trigger #517489) (Marshall, et al., GCN Circ. 13038). The BAT ground-calculated position is RA, Dec = 258.551, -13.068 deg, which is RA(J2000) = 17h 14m 12.2s Dec(J2000) = -13d 04' 05.0" with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 62%. The mask-weighted light curve shows two nearly separated peaks, the first starting at ~T-15 sec, peaking at ~T_0, and the minimum between the two peaks is at ~T+5 sec. The second peak peaks at ~T+10 sec, and returns to baseline at ~T+22 sec. T90 (15-350 keV) is 28.2 +- 5.5 sec (estimated error including systematics). The time-averaged spectrum from T-13.88 to T+21.63 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.96 +- 0.14. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+9.04 sec in the 15-150 keV band is 1.5 +- 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/517489/BA/
GCN 13042 table
GRB_name GRB120311B
GCN_number 13042
Detection_method Swift-XRT Det
ra 258.5621°
decl -13.0514°
Circular_text TITLE: GCN CIRCULAR NUMBER: 13042 SUBJECT: GRB 120311B: Enhanced Swift-XRT position DATE: 12/03/11 21:54:08 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 4834 s of XRT Photon Counting mode data and 10 UVOT images for GRB 120311B, 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 = 258.56208, -13.05144 which is equivalent to: RA (J2000): 17h 14m 14.90s Dec (J2000): -13d 03' 05.2" 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 13044 table
GRB_name GRB120311B
GCN_number 13044
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13044 SUBJECT: GRB 120311B: Swift-XRT refined Analysis DATE: 12/03/12 08:11:59 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo (INAF-OAB) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift-XRT team: We have analysed 10 ks of XRT data for GRB 120311B (Marshall et al. GCN Circ. 13038), from 3.1 ks to 22.9 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 13042). The light curve can be modelled with a power-law decay with a decay index of alpha=0.69 (+/-0.11). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.01 (+0.22, -0.21). The best-fitting absorption column is 3.6 (+0.9, -0.8) x 10^21 cm^-2, in excess of the Galactic value of 1.6 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 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: 3.6 (+0.9, -0.8) x 10^21 cm^-2 Galactic foreground: 1.6 x 10^21 cm^-2 Excess significance: 3.9 sigma Photon index: 2.01 (+0.22, -0.21) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00517489. This circular is an official product of the Swift-XRT team.
GCN 13045 table
GRB_name GRB120311B
GCN_number 13045
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13045 SUBJECT: GRB 120311B: Faulkes Telescope North observations DATE: 12/03/12 08:58:55 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi (U. Ferrara), A. Melandri (INAF-OAB), F. Virgili (LJMU), J. Japeli (U. Ljubljana) on behalf of a larger collaboration report: "The 2-m Faulkes Telescope North robotically followed up GRB 120311B (Swift trigger 517489, Marshall et al., GCN Circ 13038) 200 sec after the GRB trigger time. Within the enhanced XRT error circle (Osborne et al., GCN Circ. 13042) we do not detect any object in R and i' filters down to the following limits: Mid time from Exposure Filter Magnitude GRB (hr) (s) ---------------------------------------------------------- 0.29 240 R > 20.5 0.39 220 i' > 20.3 ---------------------------------------------------------- Values are calibrated against nearby USNOB-1 field stars.
GCN 13046 table
GRB_name GRB120311B
GCN_number 13046
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 13046 SUBJECT: GRB 120311B: MITSuME Okayama Optical upper limits DATE: 12/03/12 09:14:49 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 120311B (Marshall et al., GCNC 13038) 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 2012-03-11 16:48:04 UT (~1.7 h after the burst) We did not find any new point source within the enhanced XRT circle (Osborne et al., GCNC 13042) in all the three bands. Three sigma upper limits of the OT are listed below. We used SDSS catalog for flux calibration. T0+[day] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------ 0.09146 17:19:52 4380.0 >18.7 >18.8 >18.3 0.15451 18:50:40 4740.0 >19.6 >19.6 >18.9 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 13047 table
GRB_name GRB120311B
GCN_number 13047
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 13047 SUBJECT: GRB 120311B: Swift/UVOT Upper Limits DATE: 12/03/12 12:15:09 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (MSSL-UCL) and F. E. Marshall (NASA/GSFC) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 120311B 3072 s after the BAT trigger (Marshall et al., GCN Circ. 13038). No optical afterglow consistent with the XRT position (Osborne et al., GCN Circ. 13042) 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 3072 3222 147 >21.4 white 3072 16503 2114 >22.8 v 3228 21300 2013 >20.3 b 4048 15591 1233 >20.7 u 3843 5479 393 >19.7 w1 3638 22969 1136 >20.9 m2 3433 22206 1082 >20.8 w2 4460 17192 1754 >21.9 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.52 in the direction of the burst (Schlegel et al. 1998).
GCN 13050 table
GRB_name GRB120311B
GCN_number 13050
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13050 SUBJECT: GRB 120311B: C88 optical limits DATE: 12/03/12 18:32:49 GMT FROM: Simone Leonini at Monarrenti Obs Simone Leonini and Paolo Rosi (Montarrenti Observatory, Siena, Italy) report: We observed the field of GRB 120311B (Swift trigger 517489, Marshall et al., GCN Circ 13038) with 0.53m RC telescope + U47 detector at Montarrenti Observatory (Siena, Italy, IAU code C88). The first session of observations was started at 2012-03-12 03:59:24 UT and stopped at 2012-03-12 04:00:07 UT. The second session started at 04:11:47 UT and stopped at 04.12.26 UT (~13 hours after the trigger). Four unfiltered images of 40s exposure was obtained. We do not detect any new point source in the coadded images (limit R~18.9, USNO-B1 catalogue) within the enhanced XRT error circle (Osborne et al., GCN Circ. 13042). Target was very low on the horizon. [GCN OPS NOTE(12mar12): Distribution was delayed by ~3 hrs until an account could be created.]
GCN 13059 table
GRB_name GRB120311B
GCN_number 13059
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 13059 SUBJECT: GRB 120311B: Optical follow-up DATE: 12/03/13 13:54:28 GMT FROM: Shashi Bhushan Pandey at ROTSE Brajesh Kumar, Vijay Kumar Bhatt, S.B. Pandey (ARIES, Nainital, India, on behalf of larger Indian GRB collaboration). GRB 120311B field (Marshall et al., GCN Circ 13038) was observed with the newly installed 1.3m Devasthal Fast Optical Telescope at Nainital. Several images in R_c pass-band (300 sec each) were taken in two sessions starting at UT 21:11:10, 11-03-2012. In the initial co-added R_c frame (3x300sec), we did not detect any new optical source within the XRT error-box (Osborne et al., GCN Circ. 13042) down to a limiting magnitude of ~ 20.5 mag. The photometry was done in comparison to nearby USNO- B1 stars. This massage may be cited.