//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14527 SUBJECT: GRB 130502A: Swift detection of a burst DATE: 13/05/02 18:07:57 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT E. Troja (NASA/GSFC/UMCP), A. A. Breeveld (UCL-MSSL), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), N. Gehrels (NASA/GSFC), S. T. Holland (STScI), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU), M. Stamatikos (OSU/NASA/GSFC), M. C. Stroh (PSU), C. A. Swenson (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 17:50:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130502A (trigger=554996). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 138.578, -0.143 which is RA(J2000) = 09h 14m 19s Dec(J2000) = -00d 08' 35" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 5 sec. The rapidly available light curve also shows a peak in the lowest energy at T+10 sec, but it is not clear at this time whether or not the second peak is real. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 17:52:01.8 UT, 91.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 138.5690, -0.1232 which is equivalent to: RA(J2000) = 09h 14m 16.56s Dec(J2000) = -00d 07' 23.7" with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 78 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 (2.49 x 10^20 cm^-2, Kalberla et al. 2005), with an excess column of 2.5 (+1.77/-1.57) x 10^21 cm^-2 (90% confidence). UVOT took a finding chart exposure of 150 seconds with the White filter starting 95 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 E. Troja (eleonora.troja AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14528 SUBJECT: GRB 130502A: T100 Observations DATE: 13/05/02 19:42:53 GMT FROM: Tolga Guver at UA T. Guver (Sabanci Univ.), B. Ozcan (Adiyaman Univ.) E. Sonbas (Adiyaman Univ.), M. Kocak (TUG), E. Gogus (Sabanci Univ.), H. Kirbiyik (TUG) report on behalf of a larger collaboration We observed the field of Swift GRB 130502A (Troja et al. GCN#14527) with the 1.0 meter T100 telescope (TUBITAK National Observatory, Antalya - Turkey), starting May, 02, 18:17:41 UT (~ 27 minutes after the trigger). Observations were carried out in the R filter under good weather conditions. We do not detect an optical afterglow within the reported XRT error circle down to a limiting magnitude of 20.8 in the R band. Our image is calibrated using USNO A2.0 R1 magnitude of the star at RA : 135.578498, DEC : -00.149362 (J2000). We are grateful to the TUBITAK National Observatory staff for promptly scheduling the observations and their technical support. ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14531 SUBJECT: GRB 130502A: TNG candidate counterpart DATE: 13/05/02 21:37:53 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI), P. D'Avanzo (INAF/OABr), M. Cecconi (INAF/FGG), C. P. Padilla-Torres (INAF/FGG), report on behalf of the CIBO collaboration: We observed the field of GRB 130502A (Troja et al., GCN 14527) with the TNG equipped with DOLoRes. A 10-minute image in the SDSS r filer was taken starting on May 2.872 UT (3.08 hr after the GRB trigger). Close to the edge of the current XRT error circle (see http://www.swift.ac.uk/xrt_positions/), we detect a faint object, with coordinates (J2000): RA = 09:14:16.42 Dec = -00:07:23.0 The object has r = 23.49 +- 0.16 AB, calibrated against nearby SDSS DR8 stars. At the present time, we cannot assess the variability of the target, nor its relation with GRB 130502A. Further observations are planned. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14533 SUBJECT: GRB 130502A: z-band observations from GTC DATE: 13/05/02 22:23:16 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J. Gorosabel (UPV/EHU, IAA-CSIC), N. Tanvir (U. Leicester), J. P. U. Fynbo (DARK/NBI), A. Cabrera-Lavers (IAC-ULL), and C.C. Thoene (IAA-CSIC) report: We observed the afterglow of GRB 130502A (Troja et al. GCN 14527) with the 10.4m GTC telescope starting at 21:01 UT (3.18 hrs after the burst). The observation had a total exposure time of 340 s in z-band. The object reported by Malesani et al. GCN 14531 is detected with an AB magnitude of 22.6+/-0.15 as compared to stars in the SDSS DR9 catalogue. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14535 SUBJECT: GRB 130502A: OSN and IAC80 I-band observations DATE: 13/05/03 00:16:29 GMT FROM: Javier Gorosabel at IAA-CSIC J. Gorosabel (IAA-CSIC/UPV-EHU), A. de Ugarte Postigo (IAA-CSIC/DARK-NBI), J.C. Tello (IAA-CSIC), A.J. Castro-Tirado (IAA-CSIC), J. Cepa (IAC), D. Jimenez-Mejias (IAC), R. Alonso (IAC), R. Sanchez-Ramirez (IAA-CSIC), V. Casanova (IAA-CSIC), report on behalf of a larger collaboration: We observed the GRB 130502A (Troja et al. GCN 14527) optical afterglow (Malesani et al. GCN 14531; de Ugarte Postigo et al. GCN 14533) in I-band with both the 1.5m OSN and 0.82m IAC80 telescopes as follows; Tel. Hr post-GRB Texp Vega(Mag) ------------------------------------- OSN 3.13-3.71 10x200s > 22.0 IAC80 3.43-5.14 16x300s 22.75+/-0.35 ------------------------------------- calibrated against the USNO B1.0 catalogue. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14536 SUBJECT: GRB 130502A: Enhanced Swift-XRT position DATE: 13/05/03 00:24:15 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team. Using 511 s of XRT Photon Counting mode data and 1 UVOT images for GRB 130502A, 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 = 138.56888, -0.12341 which is equivalent to: RA (J2000): 09h 14m 16.53s Dec (J2000): -00d 07' 24.3" 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: 14539 SUBJECT: GRB 130502A: RATIR Optical and NIR Observations DATE: 13/05/03 06:08:32 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), 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 130502A (Troja, et al., GCN 14527) 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 from 2013/05 3.14 to 2013/05 3.17 UTC (9.48 to 10.34 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 a source within the Swift-XRT error circle (Beardmore, et al., GCN 14536), in comparison with SDSS DR8 and 2MASS, we obtain the following upper limits (3-sigma): r' > 22.82 i' > 22.66 Z > 21.65 Y > 21.45 J > 21.16 H > 20.99 These magnitudes are in the AB system and 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: 14543 SUBJECT: GRB 130502A: Swift/UVOT Upper Limits DATE: 13/05/03 15:08:05 GMT FROM: Alice Breeveld at MSSL-UCL A. A. Breeveld (MSSL-UCL) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 130502A 96 s after the BAT trigger (Troja et al., GCN Circ. 14527). An optical afterglow consistent with the position of the TNG candidate (Malesani et al. GCN Circ. 14531) is detected in the initial white exposure. Preliminary magnitude and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first white finding chart (FC) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 96 246 147 20.90 ± 0.3 white 588 608 20 >20.06 u 309 559 246 >20.6 b 564 584 20 >19.25 v 5288 5488 197 >19.81 uvw1 5698 5898 197 >20.16 uvm2 5492 5692 197 >19.96 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: 14545 SUBJECT: GRB 130502A: Fermi GBM detection DATE: 13/05/03 17:11:22 GMT FROM: George A. Younes at USRA/NASA/MSFC G. Younes (NASA/USRA) reports on behalf of the Fermi GBM Team: "At 17:50:30.74 UT on May 2 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130502A (trigger 389209833 / 130502743), which was also detected by the Swift/BAT (Troja et al. 2013, GCN 14527). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 20 degrees from Swift location. The GBM light curve consists of a single pulse with a FRED-like shape with a duration (T90) of about 3 s (50-300 keV). The time-averaged spectrum from T0-0.384 s to T0+2.880 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.0 +/- 0.3 and the cutoff energy, parameterized as Epeak, is 83 +/- 17 keV. The event fluence (10-1000 keV) in this time interval is (5.0 +/- 0.6)E-07 erg/cm^2. The 0.064-sec peak photon flux measured starting from T0-0.064 s in the 8-1000 keV band is 7 +/- 1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14547 SUBJECT: GRB 130502A: Swift-XRT refined Analysis DATE: 13/05/03 20:29:32 GMT FROM: Phil Evans at U of Leicester M.C. Stroh (PSU), D.N. Burrows (PSU), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB/PSU), G. Stratta (ASDC), P. D'Avanzo (INAF-OAB), J.A. Kennea (PSU) and E. Troja report on behalf of the Swift-XRT team: We have analysed 2.3 ks of XRT data for GRB 130502A (Troja et al. GCN Circ. 14527), from 76 s to 16.0 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The light curve can be modelled with a power-law decay with a decay index of alpha=0.68 (+/-0.07). 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 1.6 (+0.8, -0.7) x 10^21 cm^-2, in excess of the Galactic value of 2.5 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 3.4 x 10^-11 (5.3 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.6 (+0.8, -0.7) x 10^21 cm^-2 Galactic foreground: 2.5 x 10^20 cm^-2 Excess significance: 3.2 sigma Photon index: 2.2 (+/-0.3) The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00554996. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14548 SUBJECT: GRB130502A: MASTER-Net optical observations DATE: 13/05/03 21:26:20 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 GRB130502A 55 sec after notice time and 266 sec after GRB time at 2013-05-02 17:54:56.337 UT in two polarizations. On our first (50s exposure) set we haven`t found optical transient within SWIFT error-box (E. Troja et. al. GCN 14527). The 5-sigma upper limit has been about 18.5 mag The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14550 SUBJECT: GRB 130502A: Swift-BAT refined analysis DATE: 13/05/04 01:58:01 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), A. Y. Lien (NASA/GSFC/ORAU), T. Sakamoto (AGU), C. B. Markwardt (GSFC), W. H. Baumgartner (GSFC/UMBC), E. E. Fenimore (LANL), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), D. M. Palmer (LANL), G. Sato (ISAS), M. Stamatikos (OSU), E. Troja (NASA/GSFC/UMCP), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+963 sec from recent telemetry downlinks, we report further analysis of BAT GRB 130502A (trigger #554996) (Troja, et al., GCN Circ. 14527). The BAT ground-calculated position is RA, Dec = 138.579, -0.134 deg, which is RA(J2000) = 09h 14m 19.1s Dec(J2000) = -00d 08' 04.2" with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%. The mask-weighted light curve consists a single FRED pulse starting at ~T-0.3 sec, peaking at ~T+0.1 sec, and returning to baseline at ~T+4 sec. T90 (15-350 keV) is 3.0 +- 0.3 sec (estimated error including systematics). The time-averaged spectrum from T-0.19 to T+3.20 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.78 +- 0.16. The fluence in the 15-150 keV band is 3.8 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.21 sec in the 15-150 keV band is 2.9 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/554996/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 14581 SUBJECT: GRB 130502A: optical upper limit DATE: 13/05/05 22:25:32 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Rumyantsev (CrAO), K.Antoniuk (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the Swift GRB 130502A (Troja et al., GCN 14527) with AZT-11 telescope of CrAO observatory on May 02 starting on (UT) 18:20:46, i.e. ~30 min after burst trigger. We took several images in R-filter of 180 s exposure. Within enchanced XRT position (Beardmore et al., GCN 14536) we do not detect any source. Preliminary photometry of a combined image is following T_start (UT) T0+ Filter Exp. OT UpperLimit (3 sigma) mid,days s 2013-05-02T18:20:46.18 0.0419 R 3600 n/d 20.8 The photometry is based on USNO-B1.0 star 0898-0181247 09 14 15.80 -00 08 13.7 assuming R=18.02.