//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16285 SUBJECT: GRB 140516A: Swift detection of a short burst DATE: 14/05/16 20:44:47 GMT FROM: Scott Barthelmy at NASA/GSFC M. G. Bernardini (INAF-OAB), S. D. Barthelmy (GSFC), S. B. Cenko (GSFC), P. D'Avanzo (INAF-OAB), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (NASA/GSFC/ORAU), V. Mangano (PSU), C. B. Markwardt (NASA/GSFC), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), D. M. Palmer (LANL), J. L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU), M. H. Siegel (PSU) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 20:30:54 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 140516A (trigger=599188). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 252.988, +39.915 which is RA(J2000) = 16h 51m 57s Dec(J2000) = +39d 54' 53" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.1 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0.1 sec after the trigger. The XRT began observing the field at 20:32:14.0 UT, 79.3 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 252.9890, 39.9626 which is equivalent to: RA(J2000) = 16h 51m 57.35s Dec(J2000) = +39d 57' 45.4" with an uncertainty of 2.7 arcseconds (radius, 90% containment). This location is 171 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 1.52 x 10^20 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 83 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 none of the XRT error circle. 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 0.02. Burst Advocate for this burst is M. G. Bernardini (grazia.bernardini AT brera.inaf.it). 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: 16286 SUBJECT: GRB 140516A: TNG optical observations DATE: 14/05/16 23:11:44 GMT FROM: Paolo D'Avanzo at INAF-OAB P D'Avanzo, A. Melandri, M. G. Bernardini (INAF-OAB), M. Cecconi, G. Mainella (INAF/TNG) report on behalf of a larger collaboration: We observed the field of the short GRB 140516A (Bernardini et al. GCN 16285) using the DOLORES camera on the 3.6m TNG telescope sited in Canary Islands. We obtained four images with the r SDSS filter, each one lasting 180 s, at a mean time of 1.55 hours after the burst. In the co-added image we do not detect any optical afterglow inside the XRT error circle reported by Bernardini et al. (GCN 16285). The 3sigma limiting magnitude is r = 23.0 (AB). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16287 SUBJECT: GRB 140516A: ISON-Kislovodsk optical observations DATE: 14/05/16 23:52:01 GMT FROM: Alexei Pozanenko at IKI, Moscow V. Nevskiy (ISON), V. Linkov (ISON), A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI), report on behalf of larger collaboration: We observed the field of GRB 140516A (Bernardini et al., GCN 16285) with ORI-40 (0.4-m f/3) telescope of ISON-Kislovodsk observatory. Observations started on May 16 (UT) 20:39:04 and continued up to (UT) 21:11:60. We obtained several unfiltered images of 30 s and 100 s exposures. In a preliminary analysis we do not detect evident source within XRT error circle (Bernardini et al., GCN 16285) . The upper limit of a combined image is 20.5m and based on USNO-B1.0 (R2) nearby stars. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16288 SUBJECT: GRB 140516A: MASTER early optical observations DATE: 14/05/17 01:13:41 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 Lomonosov Moscow State University, 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 GRB140516A 22 sec after notice time 44 sec after trigger time at 2014-05-16 20:31:39 UT in two polarizations. On our first (10s exposure) set we haven`t found optical transient within SWIFT error-box (Bernardini et. al GCN 16285). The 5-sigma upper limit has been about 17.0 mag. As we have a set of observations after that with exposures from 10 to 180 seconds during several hours. In table 1 some limits are provided. Table 1 ------- T_start Exptime T-T_mead T-T_start T-T_stop Filter mlimit Coadd 2014-05-16 20:31:39 10 49 sec 44 sec 54 sec P| 17.0 1 2014-05-16 20:31:39 10 49 sec 44 sec 54 sec P- 16.9 1 2014-05-16 20:31:39 780 466 sec 44 sec 889 sec P| 19.6 13* 2014-05-16 20:31:39 780 466 sec 44 sec 889 sec P| 19.3 13* 2014-05-16 20:45:54 3600 2914 sec 899 sec 4930 sec P| 20.6 20 2014-05-16 20:45:54 3600 2914 sec 899 sec 4930 sec P- 20.4 20 2014-05-16 20:45:54 7200 2914 sec 899 sec 4930 sec P| + P- 21.0 40** --------------------------------------------------------------------------------- * This is a set images with diffrent exposure times from 10 to 180 seconds. ** We has images synchronously in 2 channels. Therefore we can increase twice exptime in case of constant t_start and t_stop. P- and P| is a polarization filter which are oriented at an angle 0 and 90 degrees to RA axis respectivel. T is a GRB trigger time. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16289 SUBJECT: GRB 140516A: Enhanced Swift-XRT position DATE: 14/05/17 01:35:11 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 461 s of XRT Photon Counting mode data and 1 UVOT images for GRB 140516A, 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 = 252.98931, +39.96284 which is equivalent to: RA (J2000): 16h 51m 57.43s Dec (J2000): +39d 57' 46.2" with an uncertainty of 2.4 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16290 SUBJECT: GRB 140516A: NOT optical observations DATE: 14/05/17 03:32:40 GMT FROM: Antonio de Ugarte Postigo at IAA-CSIC J. Gorosabel (IAA-CSIC, UPV-EHU), D. Xu (DARK/NBI), A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J.P.U. Fynbo (DARK/NBI), P. Jakobsson (U. Iceland), D. Malesani (DARK/NBI), N.R. Tanvir (U. Leicester), D. Watson (DARK/NBI), E. Gafton (OKC, Stockholm Univ.) and T. Libbrecht (Stockholm Univ.), report on behalf of a larger collaboration: We imaged the field of GRB 140516A (Bernardini et al. GCNC 16285) with the 2.5m Nordic Optical telescope equipped with ALFOSC. The observations were carried out in the R-band on May 16.89163-16.97005 UT (0.88-2.77 hours post burst) with a total exposure time of 13x300s. We did not detect any objects brighter than R=24.5 (3 sigma Vega limit calibrated against USNO B1.0) consistent with the enhanced XRT position (Osborne et al. GCNC 16289). [GCN OPS NOTE(17may14): Changed the Subject-line from 150416A to 140516A.] //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16291 SUBJECT: GRB 140516A: Swift-XRT refined Analysis DATE: 14/05/17 08:45:02 GMT FROM: Phil Evans at U of Leicester B.P. Gompertz (U. Leicester), M. de Pasquale (INAF-IASFPA), A. Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), M.C. Stroh (PSU), D.N. Burrows (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and M.G. Bernardini report on behalf of the Swift-XRT team: We have analysed 11 ks of XRT data for GRB 140516A (Bernardini et al. GCN Circ. 16285), from 64 s to 25.6 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 enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 16289). The light curve can be modelled with a power-law decay with a decay index of alpha=0.38 (+0.14, -0.12). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.2 (+0.7, -0.4). The best-fitting absorption column is 2 (+14, -0) x 10^20 cm^-2, consistent with the Galactic value of 1.5 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 2.9 x 10^-11 (3.1 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 2 (+14, -0) x 10^20 cm^-2 Galactic foreground: 1.5 x 10^20 cm^-2 Excess significance: <1.6 sigma Photon index: 2.2 (+0.7, -0.4) If the light curve continues to decay with a power-law decay index of 0.38, the count rate at T+24 hours will be 1.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.7 x 10^-14 (5.0 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00599188. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16292 SUBJECT: GRB 140516A: Swift-BAT refined analysis DATE: 14/05/17 08:58:49 GMT FROM: Scott Barthelmy at NASA/GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), M. G. Bernardini (INAF-OAB), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from recent telemetry downlinks, we report further analysis of BAT GRB 140516A (trigger #599188) (Bernardini, et al., GCN Circ. 16285). The BAT ground-calculated position is RA, Dec = 252.972, 39.958 deg, which is RA(J2000) = 16h 51m 53.2s Dec(J2000) = +39d 57' 28.5" with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%. The mask-weighted light curve shows a single spike starting at ~T+0.0, peaking at ~T+0.05, and ending at ~T+0.3 sec. T90 (15-350 keV) is 0.19 +- 0.09 sec (estimated error including systematics). The time-averaged spectrum from T-0.01 to T+0.18 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.87 +- 0.33. The fluence in the 15-150 keV band is 2.3 +- 0.6 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.38 sec in the 15-150 keV band is 0.5 +- 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/599188/BA/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16293 SUBJECT: GRB 140516A: Swift/UVOT Upper Limits DATE: 14/05/17 12:23:23 GMT FROM: Paul Kuin at MSSL N. P. M. Kuin (UCL-MSSL) and Bernardini (INAF-OAB) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 140516A 84 s after the BAT trigger (Bernardini et al., GCN Circ. 16285). No optical afterglow consistent with the XRT enhanced position (Osborne et al. GCN Circ. 16289) is detected in the initial UVOT exposures. The Enhanced position overlaps with the PSF wings of a star, and the light curve is consistent with a constant source. 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 84 234 147 >20.5 u_FC 298 547 246 >21.2 white 84 12686 1178 >20.6 v 627 7762 607 >19.5 b 553 12381 1294 >20.9 u 298 8313 770 >21.0 w1 676 8172 607 >21.6 m2 651 7967 529 >21.0 w2 602 7558 607 >21.1 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16294 SUBJECT: GRB 140516A: Gemini-North limit on an optical afterglow DATE: 14/05/17 16:56:25 GMT FROM: Wen-fai Fong at CFA W. Fong and E. Berger (Harvard) report: "We observed the location of the short-duration GRB 140516A (Bernardini et al., GCN 16285) with the Gemini Multi-Object Spectrograph (GMOS) mounted on the Gemini-North 8-meter telescope at a mid-time of 2014 May 17.373 UT (12.38 hr post-burst). We obtained i-band observations for a total of 1800-sec in 0.5" seeing. We do not detect any optical source within the XRT position (Osborne et al., GCN 16289). Calibrated to SDSS, we therefore place a 3-sigma limit of i>26.1 AB mag on the optical afterglow of GRB 140516A at 12.38 hr after the burst. We thank Gemini observer Lucas Fuhrman for assistance with these observations." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16295 SUBJECT: GRB 140516A: 6 GHz upper limit DATE: 14/05/17 22:23:29 GMT FROM: Wen-fai Fong at CFA W. Fong, B. A. Zauderer and E. Berger (Harvard) report: "We observed the field of the short-duration GRB 140516A (Bernardini et al., GCN 16285) with the Karl G. Jansky Very Large Array (VLA) beginning on 2014 May 17.48 UT (14.94 hr post-burst) at a mean frequency of 6 GHz. In 1 hour of observations, we do not detect any radio source in or around the enhanced XRT position (Osborne et al., GCN 16289). We therefore place a 3-sigma limit of 24 microJy on the radio afterglow of GRB 140516A at 14.94 hr after the burst. We thank the VLA staff for quickly executing these observations." //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16296 SUBJECT: GRB 140516A: Subaru NIR imaging observations DATE: 14/05/18 03:49:48 GMT FROM: Nobuyuki Kawai at Tokyo Tech Y. Minowa, T.-S. Pyo, J.-H. Kim (Subaru, NAOJ) and N. Kawai (Tokyo Tech) report on behalf of the Subaru GRB team: We observed the field of the short GRB 140516A (Bernardini et al., GCN 16285) using IRCS+AO188 on the 8.2 m Subaru telescope, starting from 06:56 on May 17, 2014 UTC (about 10.4 hrs from the burst). We obtained the Kp-band images in 52 mas/pixel mode without AO correction for a total exposure time of 5880 sec under 0".7 seeing condition. We do not detect any source within the error circle reported by Osborne et al. (GCN 16289). We obtained the 3-sigma limit on the near-infrared afterglow of GRB 140516A of Kp>22.2 mag (Vega) at 10.4-12.7 hrs after the burst. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16297 SUBJECT: GRB 140516A: RATIR Optical and NIR Observations DATE: 14/05/18 05:22:31 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 (ORAU/GSFC), 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 the short-duration GRB 140516A (Bernardini, et al., GCN 16285) 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 2014/05 17.33 to 2014/05 17.46 UTC (11.41 to 14.56 hours after the BAT trigger), obtaining a total of 2.13 hours exposure in the r and i bands and 0.89 hours exposure in the Z, Y, J, and H bands. For a source within the Swift-XRT error circle (Osborne, et al., GCN 16289), in comparison with the SDSS DR9 and 2MASS, we obtain the following upper limits (3-sigma): r > 23.57 i > 23.39 Z > 21.70 Y > 21.52 J > 22.00 H > 21.48 These magnitudes are in the AB system and 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: 16313 SUBJECT: GRB 140516A: further Swift-XRT analysis DATE: 14/05/21 23:42:20 GMT FROM: Paolo D'Avanzo at INAF-OAB M. G. Bernardini, P. D'Avanzo, A. Melandri, S. Campana (INAF-OAB), P. A. Evans, K. L. Page (U. Leicester), E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift-XRT team: We have analysed 24.4 ks of XRT data for GRB 140516A (Bernardini et al. GCN Circ. 16285), from 92 s to 397.8 ks after the BAT trigger, in Photon Counting (PC) mode. The X-ray counterpart reported by Bernardini et al. (GCN Circ. 16285) and Gompertz et al. (GCN Circ. 16291) apparently disappeared in the data collected from t-t0=92.8 ks onwards. However, in the same dataset we find evidence for the presence of an unrelated source at the position RA, Dec = 252.99269, +39.95659 which is equivalent to: RA (J2000): 16h 51m 58.25s Dec (J2000): +39d 57' 23.7" with an uncertainty of 4.0 arcsec (radius, 90% confidence). This position is 24" away from the enhanced position for this burst reported by Osborne et al. (GCN Circ. 16289) while it is consistent with the source 165158.53+395728.9 reported in the Krawczyk et al. (2013; ApJS, 206, 4) QSO catalogue. We therefore caution that this field source is likely contaminating the late-time X-ray light curve of GRB 140516A, given the spatial proximity to its transient X-ray counterpart.