//////////////////////////////////////////////////////////////////////// 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.) //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// 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." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14159 SUBJECT: GRB 130131B: Swift detection of a burst DATE: 13/01/31 19:21:30 GMT FROM: David Palmer at LANL M. H. Siegel (PSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), J. R. Cummings (NASA/UMBC), S. T. Holland (STScI), J. A. Kennea (PSU), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and B.-B. Zhang (PSU) report on behalf of the Swift Team: At 19:10:08 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130131B (trigger=547420). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 173.952, +15.036 which is RA(J2000) = 11h 35m 48s Dec(J2000) = +15d 02' 08" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows two peaks with a total duration of about 5 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~4 sec after the trigger. The XRT began observing the field at 19:11:58.3 UT, 109.5 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source located at RA, Dec 173.95398, 15.03873 which is equivalent to: RA(J2000) = 11h 35m 48.96s Dec(J2000) = +15d 02' 19.4" with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 11 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 (2.81 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.8 (+2.32/-2.04) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 113 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 0.03. Burst Advocate for this burst is M. H. Siegel (siegel AT swift.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.) //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14161 SUBJECT: GRB 130131B: Zadko observatory - Gingin optical observations DATE: 13/01/31 22:37:58 GMT FROM: Alain Klotz at CESR-CNRS A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR), D. Coward (UWA), B. Gendre (IRAP-CNRS-OMP), M. Boer, K. Siellez, H. Dereli , O. Bardho (UNS-CNRS-OCA), A. Williams (PO-UWA), R. Martin (PO-UWA) report: We imaged the field of GRB 130131B detected by SWIFT (trigger 547420) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 70.2s after the GRB trigger (43.4s after the notice). The elevation of the field decreased from 43 degrees above horizon but gibbous moon was at 23 degrees away from the GRB position. The first image is trailed with a duration of 60.0s (see the description in Klotz et al., 2006, A&A 451, L39). We do not detect any OT at the XRT position (Siegel et al. GCNC 14159) with a limiting magnitude of: t0+70.2s to t0+130.2s : R > 15.6 The second image is 30.0s exposure in tracking mode: t0+149s to t0+179s : R > 16.5 An image follow-up continued until 1.5h after the GRB showing no optical transcient at the limiting magnitude 16.5. The gibbous moon prevents to obtain deeper limiting magnitudes. Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14162 SUBJECT: GRB 130131B: TAROT Calern observatory optical observations DATE: 13/01/31 22:39:23 GMT FROM: Alain Klotz at CESR-CNRS Klotz A. (IRAP-CNRS-OMP), Gendre B. (IRAP-CNRS-OMP), Boer M., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report: We imaged the field of GRB 130131B detected by SWIFT (trigger 547420) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 1.2h after the GRB trigger because the GRB occured when the field of view was under the local horizon. At the start of the observations, the elevation of the field increased from 10 degrees above horizon and gibbous moon was at 25 degrees away from the GRB position. We co-added a series of exposures. No optical transcient was detected at the XRT position (Siegel et al. GCNC 14159) with a limiting magnitude of: t0+1.3h - 2.2h : R > 17.1 Magnitudes were estimated with the nearby NOMAD1 stars and are not corrected for galactic dust extinction. //////////////////////////////////////////////////////////////////////// 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/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14164 SUBJECT: GRB 130131B: Swift-BAT refined analysis DATE: 13/01/31 23:16:16 GMT FROM: Scott Barthelmy at NASA/GSFC T. Sakamoto (AGU), 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), A. Lien (GSFC/ORAU), C. B. Markwardt (GSFC), D. M. Palmer (LANL), G. Sato (ISAS), M. H. Siegel (PSU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-119 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130131B (trigger #547420) (Siegel, et al., GCN Circ. 14159). The BAT ground-calculated position is RA, Dec = 173.957, 15.033 deg which is RA(J2000) = 11h 35m 49.6s Dec(J2000) = +15d 01' 59.3" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 51%. The mask-weighted light curve shows a single pulse starting at ~T-1 sec, peaking at ~T+0.5 sec, and ending at ~T+10 sec. T90 (15-350 keV) is 4.30 +- 0.26 sec (estimated error including systematics). The time-averaged spectrum from T-0.28 to T+4.37 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.15 +- 0.20. The fluence in the 15-150 keV band is 3.4 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.28 sec in the 15-150 keV band is 1.0 +- 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/547420/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14165 SUBJECT: GRB 130131B: Enhanced Swift-XRT position DATE: 13/02/01 00:46:27 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 2472 s of XRT Photon Counting mode data and 5 UVOT images for GRB 130131B, 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 = 173.95566, +15.03818 which is equivalent to: RA (J2000): 11h 35m 49.36s Dec (J2000): +15d 02' 17.5" 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. //////////////////////////////////////////////////////////////////////// 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] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14167 SUBJECT: GRB 130131B: MITSuME Okayama optical upper limits DATE: 13/02/01 01:00:50 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 130131B (Siegel et al., GCNC 14159) 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 19:11:04 UT (~57 sec after the burst). We did not find any new point source within the enhanced XRT circle (Goad et al., GCNC 14165) 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 ------------------------------------------------------ 0.03838 20:05:23 4800.0 >19.8 >19.9 >19.2 ------------------------------------------------------ T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec] //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14169 SUBJECT: GRB 130131B: Swift/UVOT Upper Limits DATE: 13/02/01 03:17:28 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130131B 114 s after the BAT trigger (Siegel et al., GCN Circ. 14159). No optical afterglow consistent with the XRT position 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 114 264 147 >20.9 u_FC 327 577 246 >20.2 white 114 6416 449 >22.0 v 3871 5506 393 >19.8 b 583 6325 413 >20.5 u 327 6120 639 >21.0 w1 4281 5915 393 >20.4 m2 4076 5710 393 >20.6 w2 5101 5301 197 >21.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14170 SUBJECT: GRB 130131B: IAC80 I-band observations DATE: 13/02/01 04:09:46 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA/CSIC-UPV/EHU), L. Monteagudo Narvion (IAC), D. Malesani (DARK/NBI), S. Schulze (PUC, MCSS), report on behalf of a larger collaboration: "We observed the GRB 130131B (Siegel et al., GCNC 14159) at the Swift/XRT location reported in Goad et al. (GCNC 14165) with the 82cm IAC80 telescope at the Observatorio del Teide (Tenerife, Spain). I-band images with a total exposure time of 13x250s were taken on Feb 1.0135-1.0832 UT (5.2-6.8 hours post burst). No object brighter than I~21.2 mag (Vega, calibrated against USNO B1.0 and not corrected for Galactic Extinction) was detected inside the XRT error circle (Goad et al., GCNC 14165)." //////////////////////////////////////////////////////////////////////// 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." //////////////////////////////////////////////////////////////////////// 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." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14173 SUBJECT: GRB 130131B: GROND Upper limits DATE: 13/02/01 14:07:31 GMT FROM: Karla Varela at MPE F.Knust, K.Varela, J.Greiner (all MPE Garching) report on behalf of the GROND team: We observed the field of GRB 130131B (Swift trigger 547420; Siegel et al., GCN 14159) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory (Chile). Observations started at 04:00 UT on February 1st, 9 hrs after the GRB trigger, only 27 deg away from the moon. They were performed at an average seeing of 2.9” and at an average airmass of 1.6. We do not detect a source within the Swift-XRT error circle reported by Goad et al. (GCN 14165) down to 3-sigma AB limiting magnitudes g' > 23.4, r' > 23.7, i' > 23.4, z' > 23.3, J > 21.2, H > 20.5 and K > 19.7 The given limits are derived based on calibrating the images against GROND zeropoints in g'r'i'z' and 2MASS field stars in JHK and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.03mag in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14174 SUBJECT: GRB 130131B: VLT/X-shooter acquisition camera limits DATE: 13/02/01 14:16:07 GMT FROM: Nial Tanvir at U.Leicester S. Schulze (PUC, MCSS), Z. Cano (U. Iceland), J. Hjorth, D. Malesani, J. P. U. Fynbo, D. Xu (DARK/NBI) and N. R. Tanvir (U. Leicester) report on behalf of a larger collaboration: We observed GRB 130131B (Siegel et al., GCN Circ. 14159) with ESO/VLT X-shooter. Our observation began at 5:49 UT on 1 February, i.e. 10.7 hours post burst. We imaged the field with the acquisition camera in the r' and z' bands for 3x100 and 4x100 seconds, respectively. We found no optical counterpart within the revised Swift/XRT X-ray error circle reported in Goad et al. (GCN Circ. 14165) down to a limiting magnitudes of approximately 23.2 and 22.7 mag in r' and z' band, respectively. These measurements are given in the AB system and not corrected for foreground extinction. We thank the ESO staff at Paranal, and in particular Maja Vuckovic and Stephane Brillant for quickly performing the observations. //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14176 SUBJECT: GRB 130131B: Swift-XRT refined Analysis DATE: 13/02/01 19:21:17 GMT FROM: Phil Evans at U of Leicester M.C. Stroh (PSU), D.N. Burrows (PSU), P.A. Evans (U. Leicester), O.M. Littlejohns (U. Leicester), J.P. Osborne (U. Leicester), V. Mangano (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), J.A. Kennea (PSU) and M.H. Siegel report on behalf of the Swift-XRT team: We have analysed 3.1 ks of XRT data for GRB 130131B (Siegel et al. GCN Circ. 14159), from 117 s to 6.4 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN. Circ 14165). The light curve can be modelled with a power-law decay with a decay index of alpha=1.15 (+0.09, -0.08). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.2 (+/-0.3). The best-fitting absorption column is 4.2 (+1.3, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 2.8 x 10^20 cm^-2 (Kalberla et al. 2005). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (7.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.2 (+1.3, -1.1) x 10^21 cm^-2 Galactic foreground: 2.8 x 10^20 cm^-2 Excess significance: 5.6 sigma Photon index: 2.2 (+/-0.3) If the light curve continues to decay with a power-law decay index of 1.15, the count rate at T+24 hours will be 1.7 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.7 x 10^-14 (1.4 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/00547420. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14179 SUBJECT: GRB 130131B: RATIR Upper Limits DATE: 13/02/02 14:51:20 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Alan M. Watson (UNAM), 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 (UCSC), Eleonora Troja (GSFC), Enrico Ramirez‐Ruiz (UCSC), José A. de Diego (UNAM), Leonid Georgiev (UNAM), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130131B (Siegel et al., GCN 14159) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir. Between 2013 February 1.42 and 2013 February 1.54 UTC (14.86 to 17.70 hrs after the BAT trigger), we obtained 1.96 hrs exposure in the r and i bands and 0.73 hrs exposure in the Z, Y, J, and H bands. We detect no source within the XRT error circle (Goad et al., GCN 14165). In comparison with SDSS DR8 and 2MASS, we derive the following upper limits (3-sigma) in the AB magnitude system: r' > 23.8 i' > 23.1 Z > 22.1 Y > 21.7 J > 21.8 H > 21.4 These magnitudes are not corrected for Galactic extinction in the direction of the GRB. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir. //////////////////////////////////////////////////////////////////////// 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). //////////////////////////////////////////////////////////////////////// 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 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14187 SUBJECT: GRB 130131B: optical upper limit in Mondy observatory DATE: 13/02/07 15:20:15 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 130131B (Siegel et al., GCN 14159) with AZT-33IK telescope of Sayan observatory (Mondy) on Jan. 31 between (UT) 19:51:32-20:51:58. We took several images in R-filter of 60 s exposure. Within enhanced XRT position (Goad et al., GCN 14165) we do not detect any source in a combined image. Photometry is based on nearby SDSS DR8 stars. UT start, t-t0 filter Exp. OT UL (3 sigma) (mid, days) (s) 19:51:32 0.04973 R 60x60 n/d 22.5 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14193 SUBJECT: GRB 130131B: MITSuME Akeno Optical upper limits DATE: 13/02/10 13:58:00 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 130131B (Siegel et al., GCNC 14159) 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 19:10:57 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 ------------------------------------------------------------------------------------------- 70 19:12:07 60 >16.4 >16.4 >16.2 178 19:13:55 240 >17.4 >17.6 >17.4 1183 19:30:40 1320 >18.6 >19.0 >18.9 2769 19:57:06 4200 >19.1 >19.6 >19.5 ------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec] //////////////////////////////////////////////////////////////////////// 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] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14202 SUBJECT: GRB 130131B: CTIO 0.9-m optical upper-limits DATE: 13/02/13 18:57:53 GMT FROM: Francisco Virgili at Liverpool John Moores U D. Caldern Espinoza, B. Indahl, L. Paredes Alvarez, C. Kaleida (CTIO), and F. J. Virgili (LJMU) report: "As part of the REU/PIA student program at the Cerro Tololo Inter-American Observatory (CTIO) we observed GRB 130131B (Siegel et al., GCN 14159) with the SMARTS 0.9-m telescope beginning 11.6 hrs after the Swift trigger. No optical counterpart is detected within the XRT error circle to the following conservative limits: Midtime of exposure Exposure time Filter Magnitude -------------------------------------------------------------------------- 12.7 hr 7x450s R > 20.7 12.8 hr 7x450s V > 20.3 -------------------------------------------------------------------------- Magnitudes are calibrated using nearby USNOB-1 (R-band) and NOMAD (V-band) stars." //////////////////////////////////////////////////////////////////////// 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14286 SUBJECT: GRB 130131B: host detection and redshift DATE: 13/03/11 14:20:28 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Johan P. U. Fynbo, Dong Xu, Daniele Malesani, Thomas Kruehler (DARK/NBI), Dan A. Perley (Caltech), Valerio D'Elia (ASDC, INAF), report on behalf of the X-shooter GTO GRB collaboration: We observed the field of GRB 130131B (Siegel et al., GCN 14159) using the Keck-I telescope equipped with the LRIS instrument. Observations were carried out on 2013 February 10 (9.62 days after the burst), simultaneously in the g and I bands, for a total exposure time of 750 and 720 s, respectively. A source with g = 25.7 (AB) and I = 24.9 (Vega) is detected inside the enhanced XRT error circle (which has a radius of 1.8"; Goad et al., GCN 14165), at coordinates: R.A.(J2000) = 11:35:49.31 Dec.(J2000) = +15:02:18.0 We consider this object to be the likely host galaxy of GRB 130131B. A spectrum of this source was taken on 2013 March 9 with the ESO VLT equipped with the X-shooter spectrograph, covering the wavelength range 3000-20000 AA. The exposure time was 8x900 s. In the NIR arm, we detect three emission lines, interpreted as [O III] (4960, 5007) and [O II] (3727), all at a common redshift z = 2.539. In the UVB arm, the host continuum is detected down to ~4400 AA, which corresponds to the onset of the Lyman alpha forest at the proposed redshift. We acknowledge excellent support from the observing staff at Mauna Kea and Paranal, in particular Emanuela Pompei, Claudio Melo, and Thomas Rivinius.