GRB130907A

This page lists all entries on GRB130907A in GRBweb

Summary IPN Swift Fermi LAT GCN 15183 GCN 15184 GCN 15187 GCN 15191 GCN 15192 GCN 15193 GCN 15194 GCN 15195 GCN 15198 GCN 15199 GCN 15200 GCN 15201 GCN 15202 GCN 15203 GCN 15204 GCN 15205 GCN 15207 GCN 15208 GCN 15209 GCN 15211 GCN 15220 GCN 15223 GCN 15240

Summary table
Variable Value Source
GRB_name_Fermi GRB130907904
T0 21:39:15.997 UTC GCN_circulars,Konus-Wind Det
ra 215.8918° Swift
decl 45.6075° Swift
pos_error 6.47e-05° Swift
fluence 1.40e-04 erg/cm² Swift
redshift 1.2380
GBM_located False
mjd 56542.9022684838 GCN_circulars,Konus-Wind Det
IPN table
GRB_name GRB130907A
ra 215.8792°
decl 45.6167°
pos_error 5.00e-02°
redshift 1.2380
Swift table
GRB_name GRB130907A
t_trigger 21:41:13 UTC
ra 215.8918°
decl 45.6075°
pos_error 6.47e-05°
fluence 1.40e-04 erg/cm²
redshift 1.2380
Fermi LAT table
GRB_name_Fermi GRB130907904
GRB_name GRB130907A
MET 400282942.0
datum 2013-09-07
t_trigger 21:42:19 UTC
ra 215.8918°
decl 45.6075°
pos_error 1.39e-04°
GCN 15183 table
GRB_name GRB130907A
GCN_number 15183
Detection_method Swift Det
t_trigger 21:41:13 UTC
ra 215.8770°
decl 45.6160°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15183 SUBJECT: GRB 130907A: Swift detection of a burst with an optical counterpart DATE: 13/09/07 21:53:31 GMT FROM: David Palmer at LANL M. J. Page (UCL-MSSL), A. P. Beardmore (U Leicester), D. N. Burrows (PSU), N. Gehrels (NASA/GSFC), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), C. Pagani (U Leicester), K. L. Page (U Leicester), D. M. Palmer (LANL) and V. N. Yershov (UCL-MSSL) report on behalf of the Swift Team: At 21:41:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130907A (trigger=569992). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 215.877, +45.616 which is RA(J2000) = 14h 23m 31s Dec(J2000) = +45d 36' 58" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex multi-peaked structure with a duration of about 120 sec. The peak count rate was ~60000 counts/sec (15-350 keV), at ~25 sec after the trigger. The XRT began observing the field at 21:42:19.3 UT, 66.6 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 215.8926, 45.6094 which is equivalent to: RA(J2000) = +14h 23m 34.22s Dec(J2000) = +45d 36' 33.8" with an uncertainty of 5.0 arcseconds (radius, 90% containment). This location is 45 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. The initial flux in the 0.1 s image was 6.33e-08 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 74 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 14:23:34.03 = 215.89181 DEC(J2000) = +45:36:27.1 = 45.60753 with a 90%-confidence error radius of about 0.61 arc sec. This position is 7.0 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.55 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01. Burst Advocate for this burst is M. J. Page (m.page AT ucl.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 15184 table
GRB_name GRB130907A
GCN_number 15184
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 15184 SUBJECT: GRB 130907A: MASTER early OT observations DATE: 13/09/07 22:14:19 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB130907A 18 sec after notice time and 43 sec after GRB time at 2013-09-07 21:42:00 UT in two polarizations. On our first images we found optical transient within SWIFT error-box (Page et. al. GCN15183). The object approximate magnitude is about 15.0 mag. Observations are made at very long zenith distance z=86 deg. The observations and reduction is continued. The message may be cited.
GCN 15187 table
GRB_name GRB130907A
GCN_number 15187
Detection_method Optical
ra 215.8920°
decl 45.6074°
redshift 1.2380
Circular_text TITLE: GCN CIRCULAR NUMBER: 15187 SUBJECT: GRB 130907A: NOT redshift DATE: 13/09/07 23:44:37 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), D. Xu (DARK/NBI), D. Malesani (DARK/NBI), J. Gorosabel (IAA-CSIC/UPV-EHU), P. Jakobsson (U. Iceland) and J. Kajava (NOT) report on behalf of a larger collaboration: We observed the optical afterglow of GRB 130907A (Page et al., GCN 15183; Gorbovskoy et al., GCN 15184) with the NOT equipped with the AlFOSC spectrograph and camera. The transient is clearly detected in our acquisition images, taken in a clear filter, at the following coordinates: RA(J2000) = 14:23:34.08 Dec(J2000) = +45:36:26.7 Using R-band values from nearby USNO stars, we get a magnitude R = 16.7 +- 0.1 at a mean time of 0.41 hr after the GRB, where the error is dominated by calibration uncertainties. A single spectrum of 900 s covering the range from 3800 to 8000 AA, with a resolution of ~700, was obtained with a mean epoch of 0.598 hr after the burst. The spectrum presents a strong continuum with deep spectral features of AlIII, FeII, MgII and MgI at a common redshift of z=1.238 (wavelength calibration based on archival data), which we identify as the redshift of the GRB.
GCN 15191 table
GRB_name GRB130907A
GCN_number 15191
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 15191 SUBJECT: GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow DATE: 13/09/08 02:40:43 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, J. Haislip, A. LaCluyze, J. Moore, N. Frank, D. Reichart, A. Smith, D. Caton, L. Hawkins, V. Hoette, D. Harper, R. Kron, K. Cudworth, E. Struble, R. Russell, T. Linder, T. Berger, H. T. Cromartie, R. Egger, A. Foster, K. Ivarsen, M. Maples, M. Nysewander, and J. A. Crain report: Skynet observed the Swift/XRT localization of GRB 130907A (Page et al., GCN 15183, Swift trigger 569992) with the 14" telescope at the Appalachian State University Dark Sky Observatory (DSO-14) in NC, USA (R and I bands), and with the 41" telescope of Yerkes Observatory in WI, USA (r' and i' bands). Starting at 2013-09-08, 00:43 UT (t=3.03h post-trigger) and continuing until 17:41 UT (t=35.5m-4.65h post-trigger), Skynet took a total of 42 160s exposures. We detect an uncatalogued optical source in stacked images at RA 14:23:34.03, Dec +45:36:26.7 (J2000), consistent with the afterglow position reported by de Ugarte Postigo et al. (GCN 15187), and ~8" south of the Swift-XRT localization. At t=3.4h post-trigger, R~19.6 mag. The time range of our observations is not sufficient to confirm whether the source is indeed fading. A preliminary light curve is at: http://skynet.unc.edu/grb/grb130907a.png R and I magnitudes are in the Vega system, and r' and i' are in the AB system, calibrated to 5 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction with expected E(B-V)=0.011 (Schlegel et al. 1998). Skynet observations are ongoing.
GCN 15192 table
GRB_name GRB130907A
GCN_number 15192
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 15192 SUBJECT: GRB 130907A: RATIR Optical and NIR Afterglow Confirmation DATE: 13/09/08 05:11:53 GMT FROM: Alan M. Watson at Instituto de Astronomia UNAM William H. Lee (UNAM), Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UCSC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130907A (Page et al., GCN 15183) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2013/09 8.14 to 2013/09 8.15 UTC (5.57 to 6.03 hours after the BAT trigger), obtaining a total of 0.36 hours exposure in the r and i bands and 0.15 hours exposure in the Z, Y, J, and H bands. We detect a source at 14:23:34.01 +45:36:27.0 J2000 (+/- 0.5") with r = 20.01 +/- 0.03 i = 19.30 +/- 0.02 Z = 18.78 +/- 0.05 Y = 18.48 +/- 0.06 J = 18.13 +/- 0.06 H = 17.63 +/- 0.05 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. This source is outside the Swift-XRT error circle, but is only 0.8 arcsec from the transient source reported by de Ugarte Postigo et al. (GCN 15187) and 0.2 arcsec from the transient source reported by Trotter et al. (GCN 15191). From the close positional coincidence and fading magnitudes (r of 16.7, 19.6, and 20.0), we conclude all three observations are of the optical transient. The transient source is 0.5 arcsec from the faint galaxy SDSS J142333.95+453626.2, but is 1-2 magnitudes brighter in riZ. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 15193 table
GRB_name GRB130907A
GCN_number 15193
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 15193 SUBJECT: GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow DATE: 13/09/08 06:28:32 GMT FROM: Adam S. Trotter at UNC-Chapel Hill/PROMPT/Skynet A. Trotter, D. Reichart, J. Haislip, A. LaCluyze, K. McLin, L. Cominsky, A. B. Smith, D. Caton, L. Hawkins, V. Hoette, K. Cudworth, D. Harper, R. Kron, T. Linder, R. Russell, E. Struble, T. Berger, H. T. Cromartie, R. Egger, A. Foster, N. Frank, K. Ivarsen, M. Maples, J. Moore, M. Nysewander, and J. A. Crain report: In Trotter et al. (GCN 15191), we reported Skynet observations of the Swift/XRT localization of GRB 130907A (Page et al., GCN 15183, Swift trigger 569992) with the 14" telescope at the Appalachian State University Dark Sky Observatory (DSO-14) in NC, USA (R and I bands), and with the 41" telescope of Yerkes Observatory in WI, USA (r' and i' bands). Skynet continued observing the field with the 14" GLAST Optical Robotic Telescope (GORT) at the Hume observatory in CA, USA. From t=5.9h - 8.2h post-trigger, GORT took a total of 54x160s exposures in the R and I bands. We confirm a fading afterglow at the position reported by de Ugarte Postigo et al. (GCN 15187) and by Lee et al. (GCN 15192). The afterglow fades from I=18.1 mag at t=3.2h to I=19.2 mag at t=8.2h, consistent with a power-law index alpha~-0.9. A preliminary light curve is at: http://skynet.unc.edu/grb/grb130907a_2.png R and I magnitudes are in the Vega system, and r' and i' magnitudes are in the AB system, calibrated to 5 APASS stars in the field. Magnitudes have not been corrected for line-of-sight Milky Way dust extinction, with expected E(B-V)=0.011 (Schlegel et al. 1998). No further Skynet observations are scheduled.
GCN 15194 table
GRB_name GRB130907A
GCN_number 15194
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 15194 SUBJECT: GRB 130907A: Early Tautenburg detections, red afterglow DATE: 13/09/08 13:13:03 GMT FROM: Alexander Kann at TLS Tautenburg S. Schmidl (TLS Tautenburg), D. A. Kann (MPE Garching), S. Klose, S. Stecklum, F. Ludwig (all TLS Tautenburg), and J. Greiner (MPE Garching) report: We observed the field of the intense GRB 130907A (Swift trigger 569992, Page et al., GCN #15183) with the 1.34m Tautenburg Schmidt telescope. Starting at 22:02:18 UT (21 minutes after the trigger), we obtained in total 3 x 120 sec Ic-band images and 12 Rc-band images of 120 sec and 60 sec exposure. Observations were obtained at high airmass of 2.6 - 3.2. The afterglow is clearly detected on all frames. Using the star at RA (J2000) = 14:23:28.93, Dec. (J2000) = +45:37:33.65, for which we derive Rc = 15.10, Ic = 14.51 using SDSS magnitudes and the transformations of Lupton (2005), we derive preliminary magnitudes for the first image in each filter of: Time (d) Filter mag error 0.0152 Ic 15.26 0.03 0.0172 Rc 16.57 0.03 not corrected for the very small reddening of 0.01 mag along the line of sight (Schlegel et al. 1998). We note Swift was slewing when GRB 130907A started, the extended raw BAT light curve (http://gcn.gsfc.nasa.gov/notices_s/sw00569992000msbx.gif) shows the GRB began about 120 seconds before Swift T_0. Adding this time to our observing times, we find the data is well-described by a single power- law decay with alpha = 1.39 +/- 0.02. The detection by Trotter et al. (GCN #15191) agrees excellently with the extrapolation of our data, while the RATIR detection (Lee et al., GCN #15192), after transforming to Vega mag, indicates that the decay has slowed, which is confirmed by Trotter et al. (GCN #15193). The very early detection by Gorbovskoy et al. (GCN #15184) lies several magnitudes under a back-extrapolation of our data. We derive a very large Rc-Ic color of about 1.2 mag from the fit, indicating possible strong reddening (see also the Skynet light curve, GCN #15193, and the multicolor RATIR mags, GCN #15192), which would be in accordance with the very strong absorption lines detected by de Ugarte Postigo et al. (GCN #15187). This message may be cited.
GCN 15195 table
GRB_name GRB130907A
GCN_number 15195
Detection_method Swift-UVOT Det
ra 215.8918°
decl 45.6075°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15195 SUBJECT: GRB 130907A: Swift/UVOT Detection DATE: 13/09/08 17:37:39 GMT FROM: Samantha Oates at MSSL S. R. Oates (UCL-MSSL) and M. J. Page (UCL-MSSL) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130907A 74 s after the BAT trigger (Page et al., GCN Circ. 15183). A source consistent with the XRT position (Page et al. GCN Circ. 15183) is detected in the initial UVOT exposures. The preliminary UVOT position is: RA (J2000) = 14:23:34.04 = 215.89183 (deg.) Dec (J2000) = +45:36:27.1 = 45.60753 (deg.) with an estimated uncertainty of 0.50 arc sec. (radius, 90% confidence). Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white 74 224 147 15.45 +/- 0.02 v 616 636 20 16.29 +/- 0.16 b 542 562 20 16.78 +/- 0.12 u 286 536 246 15.87 +/- 0.04 w1 666 1113 117 18.54 +/- 0.31 m2 641 1606 117 >19.2 w2 592 786 38 >18.7 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 15198 table
GRB_name GRB130907A
GCN_number 15198
Detection_method Swift-XRT Det
ra 215.8922°
decl 45.6073°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15198 SUBJECT: GRB 130907A: Enhanced Swift-XRT position DATE: 13/09/08 20:33:59 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 11208 s of XRT Photon Counting mode data and 18 UVOT images for GRB 130907A, 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 = 215.89216, +45.60725 which is equivalent to: RA (J2000): 14h 23m 34.12s Dec (J2000): +45d 36' 26.1" with an uncertainty of 1.4 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 15199 table
GRB_name GRB130907A
GCN_number 15199
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 15199 SUBJECT: GRB 130907A: Swift-XRT refined Analysis DATE: 13/09/08 21:53:03 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), B.P. Gompertz (U. Leicester), J.P. Osborne (U. Leicester), V. D'Elia (ASDC), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), V. Mangano (PSU) and M.J. Page report on behalf of the Swift-XRT team: We have analysed 20 ks of XRT data for GRB 130907A (Page et al. GCN Circ. 15183), from 70 s to 60.0 ks after the BAT trigger. The data comprise 3.7 ks in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN. Circ 15198). The late-time light curve (from T0+5.7 ks) can be modelled with a power-law decay with a decay index of alpha=1.686 (+0.017, -0.016). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.761 (+0.015, -0.014). The best-fitting absorption column is 1.96 (+0.05, -0.04) x 10^21 cm^-2, in excess of the Galactic value of 1.0 x 10^20 cm^-2 (Kalberla et al. 2005). The PC mode spectrum has a photon index of 1.98 (+/-0.06) and a best-fitting absorption column of 1.85 (+0.17, -0.16) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.9 x 10^-11 (5.5 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.85 (+0.17, -0.16) x 10^21 cm^-2 Galactic foreground: 1.0 x 10^20 cm^-2 Excess significance: 17.7 sigma Photon index: 1.98 (+/-0.06) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00569992. This circular is an official product of the Swift-XRT team.
GCN 15200 table
GRB_name GRB130907A
GCN_number 15200
Detection_method VLA Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 15200 SUBJECT: GRB 130907A: VLA detection DATE: 13/09/08 22:25:42 GMT FROM: Alessandra Corsi at GWU A. Corsi (GWU) reports on behalf of a larger collaboration: We imaged the position of GRB 130907A (Page et. al. GCN 15183) with the Karl G. Jansky Very Large Array (VLA) in K-band, starting at about 4 hours after the burst. A provisional reduction shows a source consistent with the location of the GRB optical afterglow reported by de Ugarte Postigo et al. (GCN 15187). At this time, we estimate a preliminary flux of about 1.2 mJy at 24.5 GHz. Further observations are planned.
GCN 15201 table
GRB_name GRB130907A
GCN_number 15201
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 15201 SUBJECT: GRB 130907A: T21 optical observations DATE: 13/09/08 22:35:10 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Veli-Pekka Hentunen, Markku Nissinen, Harri Vilokki and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report: We have detected GRB 130907A optical afterglow at iTelescope observatory T21 (Mayhill, New Mexico) 0.43-m/6.8 astrograph and FLI-PL6303E CCD. Six unfiltered images and seven photometric R filter images with 300 sec were made. The afterglow was detected at the following position RA 14:23:34.06 and DEC +45:36:27.1 J2000. The following magnitudes were obtained from the observations using NOMAD1 1356-0257141 (R=15.220) as a comparison star: Tmid(h)+T0 Filter Exp. time Mag Mag err. 4.70 unfiltered 3x300 20.00CR 0.49 5.22 R 7x300 20.06R 0.47 5.77 unfiltered 3x300 20.36CR 0.47
GCN 15202 table
GRB_name GRB130907A
GCN_number 15202
Detection_method Swift-BAT Det
ra 215.8980°
decl 45.6020°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15202 SUBJECT: GRB 130907A, Swift-BAT refined analysis DATE: 13/09/09 01:35:56 GMT FROM: Hans Krimm at NASA-GSFC J. R. Cummings (GSFC/UMBC),S. D. Barthelmy (GSFC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU), C. B. Markwardt (GSFC), M. J. Page (UCL-MSSL),D. M. Palmer (LANL),T. Sakamoto (AGU), M. Stamatikos (OSU),J. Tueller (GSFC),T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 130907A (trigger #569992) (Page, et al., GCN Circ. 15183). The BAT ground-calculated position is RA, Dec = 215.898, 45.602 deg which is RA(J2000) = 14h 23m 35.5s Dec(J2000) = +45d 36' 08.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%. The mask-weighted light curve shows a very complicated structure with six main peaks from T-55 sec to T+95 sec. Each of these peaks shows several sub-peaks. The strongest peak is at ~T+57 sec. After T+95 sec, the count rate drops significantly, but doesn't return all the way to the background level. Then there is another weak, soft peak from T+210 sec to T+240 sec. This late peak is coincident with the start of a long flare seen in the XRT. There may be further BAT emission beyond the end of the currently available event data. T90 (15-350 keV) is 115.14 +- 0.67 sec (estimated error including systematics). The time-averaged spectrum from T-50.7 to T+234.6 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.11 +- 0.02. The fluence in the 15-150 keV band is 1.2 +- 0.0 x 10^-4 erg/cm2. The 1-sec peak photon flux measured from T+57.66 sec in the 15-150 keV band is 25.6 +- 0.5 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/569992/BA/
GCN 15203 table
GRB_name GRB130907A
GCN_number 15203
Detection_method Konus-Wind Det
t_trigger 21:39:15.997 UTC
redshift 1.2380
Circular_text TITLE: GCN CIRCULAR NUMBER: 15203 SUBJECT: Konus-Wind observation of GRB 130907A DATE: 13/09/09 10:52:42 GMT FROM: Dmitry Frederiks at Ioffe Institute S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, report: The long-duration intense GRB 130907A (Swift-BAT trigger 569992: Page, et al., GCN 15183; Cummings, et al., GCN 15202) triggered Konus-Wind at T0=77955.997 s UT (21:39:15.997), or ~118 s before the BAT trigger. The burst light curve shows multiple bright, partially overlapped pulses from ~T0-4 s till ~T0+210~s. The emission is seen up to ~15 MeV. The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB130907_T77955/ As observed by Konus-Wind, the burst had a fluence of (7.9 0.5)x10-4 erg/cm2, and a 256-ms peak flux, measured from T0+139.008 s, of (2.2 0.1)x10-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range). The time-averaged spectrum (measured from T0 to T0+206.080 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.91 0.02, the high energy photon index beta = -2.42 0.07, the peak energy Ep = 394 11 keV, chi2 = 90/92 dof. The spectrum near the maximum count rate (measured from T0+139.264 s to T0+143.872 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha = -0.65 0.03, the high energy photon index beta = -2.22 0.05, the peak energy Ep = 390 16 keV, chi2 = 111/96 dof. Assuming the NOT redshift z=1.238 (de Ugarte Postigo, et al., GCN 15187), and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.27, and Omega_Lambda = 0.73, we estimate the following rest-frame parameters of GRB 130907A: the isotropic energy release E_iso is (3.3 0.1)x10^54 erg, the peak luminosity L_iso is (2.0 0.1)x10^53 erg/s, and the rest-frame peak energy Ep,i = (880 25) keV All the quoted results are preliminary.
GCN 15204 table
GRB_name GRB130907A
GCN_number 15204
Detection_method INTEGRAL
Circular_text TITLE: GCN CIRCULAR NUMBER: 15204 SUBJECT: GRB 130907A: INTEGRAL/SPI-ACS light curve DATE: 13/09/09 15:33:25 GMT FROM: Volker Beckmann at APC V. Savchenko, V. Beckmann (APC), C. Ferrigno, E. Bozzo, M. Beck (ISDC), J. Borkowski (CAMK/Torun), D. Gtz (CEA/Saclay), S. Mereghetti (INAF/IASF-Milano), A. von Kienlin, A. Rau (MPE), and K. Hurley (SSL/Berkeley) GRB 130907A, detected by Swift/BAT (Palmer et al. GCN 15183), Fermi/LAT (Vianello et al. GCN 15196) and Konus-Wind (Frederiks et al, GCN 15203), has been independently detected by the SPI Anti-Coincidence System (ACS) on-board INTEGRAL. The SPI-ACS light curve reveals the rich multi-peak structure of this burst starting at 2013-09-07T21:39:16. Several bright peaks are followed by a major activity episode at about T0+100s. The maximum count-rate of 94,000 counts/sec (approximately corresponding to 1e-5 erg/cm2/s in the 75 keV-1 MeV range, Vigano and Mereghetti 2009) over the time bin length of 50 msec is reached at T0+115s. The total duration of this GRB is about 250 seconds. The SPI-ACS light curve of this GRB is available at: http://www.isdc.unige.ch/integral/ibas/cgi-bin/ibas_acs_web.cgi/?trigger=2013-09-07T21-39-16.00-00000-00000-0 All SPI-ACS light curves are available (both as images and data files) at http://isdc.unige.ch/Soft/ibas/ibas_acs_web.cgi. The light curves, binned at 50 ms, are derived from 91 independent detectors with different lower energy thresholds (mainly between 50 keV and 150 keV). SPI-ACS has no upper energy threshold and can detect photons with energies up to at least 100 MeV. The ACS response varies as a function of the GRB incident angle. For these reasons we caution that the count rates cannot be easily translated into physical flux units.
GCN 15205 table
GRB_name GRB130907A
GCN_number 15205
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 15205 SUBJECT: GRB 130907A: Further Swift-BAT refined analysis DATE: 13/09/09 19:41:01 GMT FROM: Hans Krimm at NASA-GSFC H. A. Krimm (GSFC/USRA), J. R. Cummings (GSFC/UMBC), D. M. Palmer (LANL), C. B. Markwardt (GSFC) for the Swift-BAT team): Using the complete data set from T-239 to T+963 sec, we report further analysis of BAT GRB 130907A (trigger #569992) (Page, et al., GCN Circ. 15183). The initial report on the BAT data was presented in Cummings, et al., GCN Circ. 15202. The burst started while Swift was slewing from another target, and the burst location came into the BAT coded field of view at about T-80 seconds. The initial pair of peaks at T-117 that triggered Konus-Wind (Golenetskii, et al., GCN Circ. 15203) and INTEGRAL/SPI-ACS (Savchenko, et al., GCN Circ. 15204) were seen from outside the coded field in the non-weighted rates. The mask-weighted light curve is described in Cummings, et al., GCN Circ. 15202. Although there are no discrete peaks later than T+240 seconds, the burst is still detected in the mask-weighted rate out to T+963 sec, when this data cuts off and continues to be detected onboard in a 64-second image starting at T+1388, and possibly later. Since the BAT event data does not cover the full extent of the burst, we cannot reliably calculate T90 at this point, but it is at least 360 seconds. The time-averaged spectrum from T-73.7 to T+767.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.17 +- 0.02. The fluence in the 15-150 keV band is 1.4 +- 0.01 x 10^-4 erg/cm2. We note that this time interval does not cover the entire burst duration, so should be considered a lower limit. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/569992/BA/
GCN 15207 table
GRB_name GRB130907A
GCN_number 15207
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 15207 SUBJECT: GRB 130907A: WSRT radio detection DATE: 13/09/10 00:48:04 GMT FROM: Alexander van der Horst at U of Amsterdam A.J. van der Horst (University of Amsterdam) reports on behalf of a large collaboration: "We observed the position of the GRB 130907A afterglow at 4.9 GHz with the Westerbork Synthesis Radio Telescope at September 9 09.99 UT to 20.69 UT, i.e. 1.51 - 1.96 days after the burst (GCN 15183). We detect a radio source with a flux density of 0.19 +/- 0.03 mJy at the position of the optical counterpart (GCN 15187). We would like to thank the WSRT staff for quickly scheduling and obtaining these observations."
GCN 15208 table
GRB_name GRB130907A
GCN_number 15208
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 15208 SUBJECT: GRB 130907A: RATIR Optical and NIR Observations DATE: 13/09/10 05:56:06 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130907A (Page et al., GCN 15183) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2013/09 10.12 to 2013/09 10.16 UTC (53.18 to 54.12 hours after the BAT trigger), obtaining a total of 0.71 hours exposure in the r and i bands and 0.30 hours exposure in the Z, Y, J, and H bands. For the source reported in Lee et al. (GCN 15192), in comparison with SDSS DR9 and 2MASS, we obtain the following detections and upper limits (3-sigma): r 21.92 +/- 0.12 i 21.38 +/- 0.09 Z > 21.37 Y > 20.87 J > 20.58 H > 19.97 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source has faded by about two magnitudes in all bands since our measurements two nights ago (Lee et al., GCN 15192). We note that the source intensity in the r and i bands is now comparable to the cataloged values for the spatially coincident galaxy SDSS J142333.95+453626.2. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 15209 table
GRB_name GRB130907A
GCN_number 15209
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 15209 SUBJECT: GRB 130907A: Continued RATIR Optical and NIR Observations DATE: 13/09/11 05:14:23 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130907A (Page et al., GCN 15183) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2013/09 11.12 to 2013/09 11.16 UTC (77.18 to 78.08 hours after the BAT trigger), obtaining a total of 0.71 hours exposure in the r and i bands and 0.30 hours exposure in the Z and Y. For the source reported in Lee et al. (GCN 15192), in comparison with SDSS DR9 and 2MASS, we obtain the following detections and upper limits (3-sigma): r 22.40 +/- 0.14 i 21.73 +/- 0.10 Z > 21.80 Y > 21.05 These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB. The source has faded by about 0.4 mags in the r and i bands relative to our observations last night (Butler et al., GCN 15208). We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 15211 table
GRB_name GRB130907A
GCN_number 15211
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 15211 SUBJECT: GRB 130907A: AMI radio detection DATE: 13/09/11 13:29:18 GMT FROM: Alexander van der Horst at U of Amsterdam G.E. Anderson, R.P. Fender, T.D. Staley (University of Southampton), A.J. van der Horst and B.A. Rowlinson (University of Amsterdam) report on behalf of a large collaboration: "We observed the position of the GRB 130907A afterglow at 15 GHz with the Arcminute Microkelvin Imager at September 8 09.90 UT to 11.90 UT, i.e. 12.2 - 14.2 hours after the burst (GCN 15183). We detect a radio source at the position of the optical counterpart (GCN 15187) with a flux density of 1.06 +/- 0.11 mJy. These observations were triggered via the system described in Staley et. al (2013, MNRAS, 428, 3114). Further follow-up observations are planned."
GCN 15220 table
GRB_name GRB130907A
GCN_number 15220
Detection_method MASTER
Circular_text TITLE: GCN CIRCULAR NUMBER: 15220 SUBJECT: GRB 130907A: MASTER refined analysis DATE: 13/09/12 18:46:58 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, D.Denisenko, V.Kornilov, A.Belinski, N.Tyurina, D.Kuvshinov, N.Shatskiy, P.Balanutsa, A.Kuznetsov, V.V.Chazov, A.Sankovich, D.Zimnukhov Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB130907A 18 sec after notice time and 43 sec after GRB time at 2013-09-07 21:42:00 UT in two polarizations. The observations were performed at low elevation (zenith angle 84 deg)and under the changing transparency conditions. The OT (Page et. al. GCN15183) appears on the 4th image in the series and is visible on four consecutive images (20, 30, 40 and 50 sec exposures) in both tubes with the signal-to-noise ratio from 3 to 6. Starting with T0+5 min, the image quality was further deteriorating with the OT visible only on the sum of two pairs of synchronous images. Our photometry results are presented in Table 1. Table 1. ------- Start date and time exptime T_start-T_trig T_mid-T_trig P| mag. err_P P- mag err_P- P| + P- err. (P| + P-) -----------------------+--------+----------------+--------------+--------+---------+----------+---------+----------+--------------- 2013-09-07 21:42:00.31 10 47 52 <10.5 --- <10.5 --- <11.0 --- 2013-09-07 21:42:22.79 10 69 74 <10.5 --- <10.5 --- <11.0 --- 2013-09-07 21:42:43.59 20 91 101 <11.0 --- <11.0 --- <11.5 --- 2013-09-07 21:43:16.66 20 123 133 12.2 0.2 13.0 0.3 12.5 0.2 2013-09-07 21:43:47.44 30 154 169 13.3 0.4 13.6 0.6 13.5 0.4 2013-09-07 21:44:29.95 40 197 217 13.7 0.5 13.7 0.6 13.9 0.5 2013-09-07 21:45:21.88 50 249 274 13.7 0.5 14.4 0.8 14.0 0.6 2013-09-07 21:46:23.87 60+80 311 387 <13.8 --- <13.7 --- 13.9 0.6 *) All time intervals in seconds. P| and P- is an unfiltered magnitude with RA and DEC orientated polaroid correspondingly. The sign '<' before magnitude means the value is upper limit. The light curve and movie available here http://master.sai.msu.ru/static/GRB/GRB130907A/grb130907A.html The epoch of our observations completely covers Swift BAT weak, soft peak from T+210 sec to T+240 sec (Cummings et. al. GCN15202). Our first automatic and not so exact (due to difficult observing conditions) estimation of the OT magnitude, given in the previous telegram (Gorbovskoy et. al GCN15184), belongs to epoch of the 5th exposure with t_mid=217 sec. after the trigger. This fact isn't clear from the telegram text that could mislead some researchers. We apologize for this inaccuracy. The message may be cited.
GCN 15223 table
GRB_name GRB130907A
GCN_number 15223
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 15223 SUBJECT: GRB 130907A: Continued RATIR Optical and NIR Observations DATE: 13/09/13 04:41:50 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), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jos A. de Diego (UNAM), Leonid Georgiev (UNAM), Jess Gonzlez (UNAM), Carlos Romn-Ziga (UNAM), Neil Gehrels (GSFC), and Harvey Moseley (GSFC) report: We observed the field of GRB 130907A (Page et al., GCN 15183) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronmico Nacional on Sierra San Pedro Mrtir from 2013/09 13.13 to 2013/09 13.16 UTC (125.49 to 126.24 hours after the BAT trigger), obtaining a total of 0.36 hours exposure in the r and i bands and 0.15 hours exposure in the Z, Y, J, and H bands. For the source reported in Lee et al. (GCN 15192), in comparison with SDSS DR9 and 2MASS, we obtain the following upper limits (3-sigma) in the AB magnitude system (not corrected for Galactic extinction in the direction of the GRB) : r > 22.68 i > 22.62 Z > 21.30 Y > 20.70 J > 20.42 H > 19.69 We conclude from our most constraining limit (i-band), that the source has faded by at least 0.9 mags since our observation 2 nights ago (Butler et al., GCN 15209). These magnitudes are now significantly fainter than the DR9 catalog magnitudes of SDSS galaxy mentioned by Lee et al. We thank the staff of the Observatorio Astronmico Nacional in San Pedro Mrtir.
GCN 15240 table
GRB_name GRB130907A
GCN_number 15240
Detection_method Optical
ra 14.0000°
decl 45.0000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 15240 SUBJECT: GRB 130907A: Maidanak optical observations DATE: 13/09/21 17:24:34 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Pozanenko (IKI), A. Volnova (IKI), B. Hafizov (UBAI), O. Burhonov (UBAI) report on behalf of larger GRB follow-up collaboration: We observed the field of Swift GRB 130907A (Page et al., GCN 15183) with AZT-22 telescope equipped with SNUCAM of Maidanak observatory starting Sep., 10 (UT) 11:04:47. We obtained 2 frames with exposures of 300 s in R filter. On stacked images we clearly detect the source reported by Lee et al., (GCN 15192). The astrometry of the source is following RA(J2000) 14 23 34.01 Dec(J2000) +45 36 36.6 with uncertainty of 0.18 arcsec in both coordinates. The details of the photometry are following: t_start, filter Exposure, t-t0, OT (UT) sec mid,days 11:04:47 R 2*300 2.56166 21.44 +/- 0.16 The photometry is based on a nearby SDSS-DR9 star J142338.63+453547.2 with R mag = 18.181 +/- 0.013 (transformation by Lupton 2005)