GRB130131A

This page lists all entries on GRB130131A in GRBweb

Summary IPN Swift GCN 14156 GCN 14157 GCN 14158 GCN 14160 GCN 14163 GCN 14166 GCN 14168 GCN 14171 GCN 14172 GCN 14175 GCN 14177 GCN 14178 GCN 14180 GCN 14182 GCN 14194 GCN 14281

Summary table
Variable Value Source
T0 13:56:22 UTC GCN_circulars,Swift Det
ra 171.1266° Swift
decl 48.0760° Swift
pos_error 1.94e-04° Swift
T90 51.6 s Swift
T90_start 13:56:22 UTC Swift
fluence 3.10e-07 erg/cm² Swift
T100 51.6 s
GBM_located False
mjd 56323.58081018519 GCN_circulars,Swift Det
IPN table
GRB_name GRB130131A
ra 171.1083°
decl 48.0667°
pos_error 5.00e-02°
Swift table
GRB_name GRB130131A
t_trigger 13:56:22 UTC
ra 171.1266°
decl 48.0760°
pos_error 1.94e-04°
T90 51.6 s
fluence 3.10e-07 erg/cm²
GCN 14156 table
GRB_name GRB130131A
GCN_number 14156
Detection_method Swift Det
t_trigger 13:56:22 UTC
ra 171.1080°
decl 48.0690°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14156 SUBJECT: GRB 130131A: Swift detection of a burst DATE: 13/01/31 14:06:54 GMT FROM: Scott Barthelmy at NASA/GSFC D. Grupe (PSU), B. N. Barlow (PSU), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), S. T. Holland (STScI), J. A. Kennea (PSU), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), C. Pagani (U Leicester), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), R. L. C. Starling (U Leicester) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 13:56:22 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130131A (trigger=547407). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 171.108, +48.069 which is RA(J2000) = 11h 24m 26s Dec(J2000) = +48d 04' 10" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peak: 1 5-sec peak at T+0 sec and a 100-sec peak at T+50 sec. with a total duration of about 60 sec. The peak count rate was ~1400 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 13:57:20.5 UT, 58.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 171.12193, 48.07520 which is equivalent to: RA(J2000) = 11h 24m 29.26s Dec(J2000) = +48d 04' 30.7" with an uncertainty of 4.4 arcseconds (radius, 90% containment). This location is 40 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 1.45 x 10^20 cm^-2 (Kalberla et al. 2005). The initial flux in the 2.5 s image was 1.22e-08 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 67 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 D. Grupe (dxg35 AT psu.edu). 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 14157 table
GRB_name GRB130131A
GCN_number 14157
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 14157 SUBJECT: GRB 130131A - UKIRT afterglow candidate DATE: 13/01/31 16:23:37 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Wold (JACH) report on behalf of a larger collaboration: We observed the field of GRB 130131A (Grupe et al. GCN 14166) with the WFCAM camera on UKIRT, beginning approximately 54 mins after the BAT trigger. Within the XRT error circle we detect a single, bright point source at position: 11 24 30.39 +48 04 33.3 (J2000, uncertainty ~0.5") Provisional Vega magnitudes (relative to a nearby 2MASS source) are K=16.4, J=19.4, indicating a rather red source. Further observations and analysis are ongoing.
GCN 14158 table
GRB_name GRB130131A
GCN_number 14158
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 14158 SUBJECT: GRB 130131A - Faulkes Telescope North Observations DATE: 13/01/31 16:27:53 GMT FROM: Francisco Virgili at Liverpool John Moores U F.J. Virgili (LJMU), C. Guidorzi (U. Ferrara), and A. Melandri (INAF-OAB) report: "The 2-m Faulkes Telescope North robotically followed up GRB 130131A (Swift trigger 547407, Grupe et al. GCN 14156) 2.88 min after the GRB trigger time. No optical counterpart is detected within the XRT error circle to the following conservative limits: Midtime from GRB Exposure Filter Magnitude (min) (s) ------------------------------------------------- 3.4 3x10s R >19.2 28.9 720s R >20.6 33.7 700s i' >20.1 ------------------------------------------------- Magnitudes are calibrated with nearby USNOB-1 and SDSS stars."
GCN 14160 table
GRB_name GRB130131A
GCN_number 14160
Detection_method Swift-XRT Det
ra 171.1262°
decl 48.0759°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14160 SUBJECT: GRB 130131A: Enhanced Swift-XRT position DATE: 13/01/31 21:29:21 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 574 s of XRT Photon Counting mode data and 1 UVOT images for GRB 130131A, 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 = 171.12621, +48.07589 which is equivalent to: RA (J2000): 11h 24m 30.29s Dec (J2000): +48d 04' 33.2" with an uncertainty of 1.8 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 14163 table
GRB_name GRB130131A
GCN_number 14163
Detection_method Swift-BAT Det
ra 171.0910°
decl 48.0640°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14163 SUBJECT: GRB 130131A: Swift-BAT refined analysis DATE: 13/01/31 23:03:50 GMT FROM: Scott Barthelmy at NASA/GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), D. Grupe (PSU), H. A. Krimm (GSFC/USRA), A. Lien (GSFC/ORAU), C. B. Markwardt (GSFC), T. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+903 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130131A (trigger #547407) (Grupe, et al., GCN Circ. 14156). The BAT ground-calculated position is RA, Dec = 171.091, 48.064 deg which is RA(J2000) = 11h 24m 21.9s Dec(J2000) = +48d 03' 51.0" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 97%. The mask-weighted light curve shows two separated peaks: (1) starting at ~T-5 sec, peaking at ~T+1 sec, and ending at ~T+15 sec, and (2) T+35, T+47, and ~T+65 sec. T90 (15-350 keV) is 51.6 +- 2.4 sec (estimated error including systematics). The time-averaged spectrum from T-0.95 to T+52.15 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.12 +- 0.32. The fluence in the 15-150 keV band is 3.1 +- 0.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.04 sec in the 15-150 keV band is 0.7 +- 0.1 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/547407/BA/
GCN 14166 table
GRB_name GRB130131A
GCN_number 14166
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 14166 SUBJECT: GRB 130131A: MITSuME Okayama optical upper limits DATE: 13/02/01 00:50:07 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 130131A (Grupe et al., GCNC 14156) 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 2013-01-31 14:53:53 UT (~58 min after the burst). We did not find any new point source within the enhanced XRT circle (Evans et al., GCNC 14160) 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 ------------------------------------------------------ 0.10111 16:21:58 9000.0 >20.5 >20.5 >19.9 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]
GCN 14168 table
GRB_name GRB130131A
GCN_number 14168
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14168 SUBJECT: GRB 130131A: Swift-XRT refined Analysis DATE: 13/02/01 02:07:03 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), A. Maselli (INAF-IASFPA), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB) and D. Grupe report on behalf of the Swift-XRT team: We have analysed 9.2 ks of XRT data for GRB 130131A (Grupe et al. GCN Circ. 14156), from 64 s to 18.8 ks after the BAT trigger. The data comprise 235 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN. Circ 14160). The late-time light curve (from T0+5.3 ks) can be modelled with a power-law decay with a decay index of alpha=1.1 (+0.4, -0.3). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.44 (+/-0.07). The best-fitting absorption column is 3.17 (+/-0.19) x 10^21 cm^-2, in excess of the Galactic value of 1.4 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 2.21 (+0.21, -0.20) and a best-fitting absorption column of 2.4 (+/-0.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (6.1 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2.4 (+/-0.6) x 10^21 cm^-2 Galactic foreground: 1.4 x 10^20 cm^-2 Excess significance: 6.5 sigma Photon index: 2.21 (+0.21, -0.20) If the light curve continues to decay with a power-law decay index of 1.1, the count rate at T+24 hours will be 2.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.3 x 10^-14 (1.6 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/00547407. This circular is an official product of the Swift-XRT team.
GCN 14171 table
GRB_name GRB130131A
GCN_number 14171
Detection_method Swift-XRT Other
ra 171.1267°
decl 48.0758°
Circular_text TITLE: GCN CIRCULAR NUMBER: 14171 SUBJECT: GRB 130131A: VLA 5.8 Ghz Detection DATE: 13/02/01 11:22:34 GMT FROM: Ashley Zauderer at CfA T. Laskar, B. A. Zauderer and E. Berger (Harvard) report on behalf of the CARMA Key Project "A Millimeter View of the Transient Universe": "We observed the position of GRB 130131A (Grupe et al.; GCN 14156) beginning 2013 Feb 1.28 (dt=0.7 d) at a mean frequency of 5.8 Ghz with the Karl G. Jansky Very Large Array. We detect a source consistent with the enhanced Swift-XRT position (Evans et al.; GCN 14160) with a flux of 38 (+/- 11) uJy. The position of this radio source is RA (J2000) 11:24:30.4 (+/- 0.2) DEC (J2000) +48:04:33.0 (+/- 1.5). Follow-up observations at multiple frequencies are in progress. We thank the VLA staff for their support."
GCN 14172 table
GRB_name GRB130131A
GCN_number 14172
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14172 SUBJECT: GRB 130131A: CARMA 3mm Observations DATE: 13/02/01 12:56:17 GMT FROM: Ashley Zauderer at CfA B. A. Zauderer, E. Berger, and T. Laskar (Harvard) report on behalf of the CARMA Key Project "A Millimeter View of the Transient Universe": "We observed the position of GRB 130131A (Grupe et al., GCN 14156) with the Combined Array for Research in Millimeter Astronomy beginning 2013 Feb 1.3 UT (0.7 d post-burst) at a mean frequency of ~85 GHz. Coincident with the Swift-XRT position (Evans et al., GCN 14160) and the VLA 5.8 GHz position (Laskar et al., GCN 14171), we report a preliminary detection of a radio source with a flux of ~0.5 mJy. Further analysis is in progress. We thank the CARMA staff for their support."
GCN 14175 table
GRB_name GRB130131A
GCN_number 14175
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14175 SUBJECT: GRB 130131A - UKIRT confirmation of afterglow DATE: 13/02/01 14:27:41 GMT FROM: Nial Tanvir at U.Leicester N. R. Tanvir (U. Leicester), A. J. Levan (U. Warwick), T. Wold (JACH) report on behalf of a larger collaboration: We re-observed the field of GRB 130131A with the WFCAM camera on UKIRT, beginning approximately 20.5 hr post-burst. The source reported by us previously (GCN 14157) is no longer detected in our provisional reduction, indicating a fading of at least 2 mag in the K-band. This confirms the source as the afterglow of the GRB (consistent also with the radio detection by Zauderer et al. GCN 14171). We also report that the afterglow was faintly visible in a Z-band image taken at UKIRT 2hr post-burst (in morning twilight), indicating that this is likely not an extreme redshift event.
GCN 14177 table
GRB_name GRB130131A
GCN_number 14177
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 14177 SUBJECT: GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval DATE: 13/02/01 19:23:05 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 547407 (Grupe, et al., GCN 14156). 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 13:56:20.65 UT, 1.4 s before the Swift trigger time and during the gamma-ray emitting interval. During the period that the BAT was detecting gamma-ray emission, from ~T-5 s to ~T+65 s (Palmer, et al., GCN 14163), we have a total of four 10 s exposures with limiting magnitudes of R~9.4 in moderate moonglow. We do not detect the optical counterpart (Tanvir et al., GCN 14157; Virgili et al., GCN 14158) in any of our images. Our 3-sigma limiting magnitudes are based on a comparison of our unfiltered image to the Tycho-2 V-band catalog.
GCN 14178 table
GRB_name GRB130131A
GCN_number 14178
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 14178 SUBJECT: GRB 130131A: RATIR optical and infrared upper limits DATE: 13/02/01 23:07:03 GMT FROM: Ori Fox at UCB Ori Fox (UCB), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Enrico Ramirez-Ruiz (UCSC), JosÈ A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes˙s Gonz·lez (UNAM), Carlos Rom·n-Z˙Òiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: Under good weather conditions, we observed the field of GRB 130131A (Grupe, et al., GCN 14156) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio AstronÛmico Nacional on Sierra San Pedro M·rtir. An extremely red (K=16.4, J=19.4) afterglow candidate was detected by Tanvir, et al. (GCN 14157). We obtained approximately 2.83 hrs (ri) and 1.07 hrs (ZYJH) of data from 2013 February 1.25 to 2023 February 1.42 UTC (16.0 to 20.0 hrs after the BAT trigger) We detect no source within the XRT error circle (Evans et al; GCN 14160) or at the position of the UKIRT source (GCN 14157). In comparison with SDSS DR8 and 2MASS, we derive the following upper limits (3-sigma) in the AB magnitude system: r' > 23.8 i' > 23.3 Z > 22.2 Y > 21.8 J > 21.9 H > 21.5 The limits are consistent with the suggested fading of at least 2 mag in K-band (GCN 14175) measured at 20.5 hours. These magnitudes are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio AstronÛmico Nacional in San Pedro M·rtir. -- Please make note of the new email address. http://astro.berkeley.edu/~ofox/website/Homepage.html
GCN 14180 table
GRB_name GRB130131A
GCN_number 14180
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14180 SUBJECT: GRB 130131A: Swift/UVOT Upper Limits DATE: 13/02/02 15:19:38 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel and D. Grupe (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130131A 68 s after the BAT trigger (Grupe et al., GCN Circ. 14156). No optical afterglow consistent with the optical position (Tanver et al., GCN Circ 14157) or XRT position (Evans et al., GCN Circ. 14160) 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 68 217 147 >21.8 u_FC 280 529 246 >20.8 white 68 7570 839 >22.5 v 609 18681 1378 >21.0 b 535 7369 549 >21.7 u 280 13670 1434 >22.0 w1 658 12906 1434 >21.7 m2 1932 18851 1263 >21.3 w2 758 17768 1336 >22.0 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 14182 table
GRB_name GRB130131A
GCN_number 14182
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 14182 SUBJECT: GRB 130131A: optical observation in Mondy observatory DATE: 13/02/06 20:27:48 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Volnova (SAI MSU/IKI), I. Korobtsev (ISTP), E. Klunko (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 130131A (Grupe et al., GCN 14156) with AZT-33IK telescope of Sayan observatory (Mondy). We took several images in R-filter of 60 s exposure on Jan. 31, between (UT) 14:12:36-15:36:53 under favorable weather conditions with a FWHM of about 2.5". In the stacked images we detected a source which is coincident with the source reported by Tanvir et al. (GCN 14157). The photometry based on SDSS DR8 is the following: t_start, T0+ (mid), filter, exp., OT+/-err UL (3 sigma) (UT) d s 14:12:36 0.01640 R 10x60 22.5 +/-0.35 22.4 14:12:36 0.04053 R 79x60 23.4 +/-0.25 23.5 Taken coincidence with source detected in IR (Tanvir et al. GCN 14157) and fading nature of the source we suggest that we detect OT of GRB 130131A. The detection in R filter confirms that the GRB 130131A is not an extreme redshift event (Tanvir et al. GCN 14175). Also we compared fluxes in X-ray and optic at ~0.016 days after trigger and found that the GRB 130131A can be considered as optically dark burst following the both criteria (Jakobsson et al., 2004; van der Horst et al., 2009). The stars used for photometry and assumed R mags: J112419.01+480710.6 11:24:19.01 +48:07:10.7 R = 18.93 J112414.86+480528.8 11:24:14.86 +48:05:28.9 R = 18.77 J112419.60+480357.4 11:24:19.61 +48:03:57.5 R = 20.32 The finding chart of the stacked image can be found in http://grb.rssi.ru/GRB130131A/GRB130131A_130131_AZT33IK.png
GCN 14194 table
GRB_name GRB130131A
GCN_number 14194
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 14194 SUBJECT: GRB 130131A: MITSuME Akeno Optical upper limits DATE: 13/02/10 14:00:06 GMT FROM: Yoichi Yatsu at Tokyo Tech. M. Hayashi, T. Yoshii, R. Usui, Y.Aoki, S. Kurita, Y. Saito, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed GRB 130131A (Grupe et al., GCNC 14156) 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 on 2013-01-31 13:57:11 UT ( ~49 sec after the burst). And we could not find any new point source within the XRT error circle in all the three bands. The results of photometry (3 sigma upper limits) are listed below. The photon flux were calibrated against GSC2.3 catalog. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------------------------------------- 33 13:57:44 60 >17.6 >17.8 >17.1 159 13:59:51 270 >18.5 >18.6 >18.0 1105 14:15:46 1440 >19.0 >19.4 >18.9 7119 15:56:00 9540 >19.9 >20.6 >19.8 ------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec]
GCN 14281 table
GRB_name GRB130131A
GCN_number 14281
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 14281 SUBJECT: GRB 130131A: JCMT SCUBA-2 sub-mm observations DATE: 13/03/11 01:49:17 GMT FROM: Ian Smith at Rice U I.A. Smith (Rice U.), R.P.J. Tilanus (Leiden Observatory), N.R. Tanvir (U. of Leicester), D.A. Frail (NRAO) report: We observed the location of GRB 130131A (Grupe et al., GCN Circ. 14156) twice using the SCUBA-2 sub-millimeter continuum camera on the James Clerk Maxwell Telescope. The first observation started at 14:36 UT on 2013-01-31, corresponding to 40 minutes after the burst trigger. It lasted 2.0 hours in good weather conditions. The second observation started at 12:40 UT on 2013-02-01, corresponding to 0.95 days after the burst trigger. It lasted 2.1 hours in good weather conditions. No source was significantly detected in the individual or combined observations at the VLA location (Laskar et al., GCN Circ. 14171). The combined RMS was 2.2 mJy/beam at 850 microns and 18.2 mJy/beam at 450 microns. We thank Iain Coulson, Jim Hoge, Callie McNew, Alexander Karim, and William Montgomerie for their prompt support of these observations.