GRB160504A

This page lists all entries on GRB160504A in GRBweb

Summary IPN Swift GCN 19382 GCN 19383 GCN 19385 GCN 19386 GCN 19387 GCN 19388 GCN 19389 GCN 19390 GCN 19391 GCN 19393 GCN 19510

Summary table
Variable Value Source
T0 19:30:37 UTC GCN_circulars,Swift Det
ra 170.0722° Swift
decl 56.0015° Swift
pos_error 1.81e-04° Swift
T90 53.9 s Swift
T90_start 19:30:37 UTC Swift
fluence 7.30e-07 erg/cm² Swift
T100 53.9 s
GBM_located False
mjd 57512.81292824074 GCN_circulars,Swift Det
IPN table
GRB_name GRB160504A
ra 170.0417°
decl 56.0000°
pos_error 5.00e-02°
Swift table
GRB_name GRB160504A
t_trigger 19:30:37 UTC
ra 170.0722°
decl 56.0015°
pos_error 1.81e-04°
T90 53.9 s
fluence 7.30e-07 erg/cm²
GCN 19382 table
GRB_name GRB160504A
GCN_number 19382
Detection_method Swift Det
t_trigger 19:30:37 UTC
ra 170.0430°
decl 55.9970°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19382 SUBJECT: GRB 160504A: Swift detection of a burst DATE: 16/05/04 19:46:00 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT D. Malesani (DARK/NBI), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), T. G. R. Roegiers (PSU), B. Sbarufatti (INAF-OAB/PSU) and T. N. Ukwatta (LANL) report on behalf of the Swift Team: At 19:30:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160504A (trigger=685124). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 170.043, +55.997 which is RA(J2000) = 11h 20m 10s Dec(J2000) = +55d 59' 48" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 10 sec. The peak count rate was ~1300 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 19:32:46.0 UT, 128.7 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 170.07309, 56.00016 which is equivalent to: RA(J2000) = 11h 20m 17.54s Dec(J2000) = +56d 00' 00.6" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 61 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 8.12 x 10^19 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 98 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 0.01. Burst Advocate for this burst is D. Malesani (malesani AT dark-cosmology.dk). 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 19383 table
GRB_name GRB160504A
GCN_number 19383
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19383 SUBJECT: GRB 160504A: TAROT Calern observatory optical observations DATE: 16/05/04 20:02:56 GMT FROM: Alain Klotz at IRAP-CNRS-OMP Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP), Boer, M., Laugier, R. (CNRS-ARTEMIS), Gendre B. (UVI - Etelman Obs.) report: We imaged the field of GRB 160504A detected by SWIFT (trigger 685124) with the TAROT robotic telescope (D=25cm) located at the Calern observatory, France. The observations started 57.1s after the GRB trigger (16.5s after the notice). The elevation of the field increased from 77 degrees above horizon and weather conditions were good but during twilight. 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 with a limiting magnitude of: t0+57.1s to t0+117.1s : R > 15.3 The second image is 30.0s exposure in tracking mode: t0+132.5s to t0+162.5s : R > 15.7 We co-added a series of exposures: t0+132.5s to t0+426.0s : R > 17.2 Magnitudes were estimated with the nearby USNO-B1 stars and are not corrected for galactic dust extinction.
GCN 19385 table
GRB_name GRB160504A
GCN_number 19385
Detection_method Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19385 SUBJECT: GRB 160504A: NOT upper limits DATE: 16/05/04 22:22:05 GMT FROM: Thomas Kruehler at MPE Garching T. Kruehler (MPE Garching), A. de Ugarte Postigo (IAA-CSIC and DARK/NBI), and T. Kuutma (NOT) report on behalf of a larger collaboration: We observed the field of GRB 160504A (Malesani et al., GCN #19382) with the NOT equipped with ALFOSC. Imaging in the r, i and z-band filter started at 20:54:10 UT on 2016-05-04, 1.4 hr after the GRB trigger. We detect no sources in the enhanced XRT error circle given at http://www.swift.ac.uk/sper/685124/. Calibrating our images against magnitudes from field stars of the SDSS catalog, we measure preliminary upper limits of r > 23.3 mag i > 22.8 mag z > 22.0 mag These limits are not corrected for the expected foreground extinction corresponding to a reddening of E(B-V) = 0.01 mag (Schlafly & Finkbeiner 2011).
GCN 19386 table
GRB_name GRB160504A
GCN_number 19386
Detection_method Swift-XRT Det
ra 170.0722°
decl 56.0016°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19386 SUBJECT: GRB 160504A: Enhanced Swift-XRT position DATE: 16/05/04 22:27:27 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 559 s of XRT Photon Counting mode data and 1 UVOT images for GRB 160504A, 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 = 170.07224, +56.00158 which is equivalent to: RA (J2000): 11h 20m 17.34s Dec (J2000): +56d 00' 05.7" with an uncertainty of 1.9 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 19387 table
GRB_name GRB160504A
GCN_number 19387
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19387 SUBJECT: GRB 160504A: Swift-XRT refined Analysis DATE: 16/05/05 03:23:39 GMT FROM: Phil Evans at U of Leicester L.M. McCauley (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), B. Sbarufatti (INAF-OAB/PSU) and D. Malesani report on behalf of the Swift-XRT team: We have analysed 7.8 ks of XRT data for GRB 160504A (Malesani et al. GCN Circ. 19382), from 80 s to 18.1 ks after the BAT trigger. The data comprise 31 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 19386). The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=2.4 (+1.2, -3.4). At T+100 s the decay steepens to an alpha of 5.5 (+0.9, -0.7). The light curve breaks again at T+209 s to a decay with alpha=0.15 (+0.08, -0.65), before a final break at T+4742 s s after which the decay index is 0.68 (+0.15, -0.14). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.97 (+/-0.15). The best-fitting absorption column is 1.1 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 8.1 x 10^19 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.4 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.1 (+/-0.4) x 10^21 cm^-2 Galactic foreground: 8.1 x 10^19 cm^-2 Excess significance: 4.4 sigma Photon index: 1.97 (+/-0.15) If the light curve continues to decay with a power-law decay index of 0.68, the count rate at T+24 hours will be 0.022 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.5 x 10^-13 (9.3 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/00685124. This circular is an official product of the Swift-XRT team.
GCN 19388 table
GRB_name GRB160504A
GCN_number 19388
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19388 SUBJECT: GRB 160504A: Bassano Bresciano Observatory upper limits DATE: 16/05/05 07:52:39 GMT FROM: Ulisse Quadri at Bassano Bresciano Obs U.Quadri, L.Strabla and R.Girelli report: We imaged the field of GRB 160504A detected by SWIFT(trigger 685124) with the robotic telescope of (IAU station 565) Bassano Bresciano Observatory, Italy. Member of: AAVSO - American Association of Variable Star Observers. ISSP - Italian Supernovae Search Project. UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili. The observations started 22.45 min after the GRB trigger, with our Schmidt telescope D=320/400 mm F/D=3.1. Weather conditions were good. We co-added 2 series of 20 exposures of 120 sec each. Start T0+ End T0+ Vlim 22.45 min 111.33 min 20 We did not found any optical counterpart in the error box of the XRTcandidate. (D. Malesani (DARK/NBI), J. A. Kennea (PSU)et al) Magnitudes were estimated with the UCAC4 cat. and are not corrected for galactic dust extinction. Reference: http://www.osservatoriobassano.org/GRB.asp The message may be cited.
GCN 19389 table
GRB_name GRB160504A
GCN_number 19389
Detection_method Other
ra 170.0716°
decl 56.0013°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19389 SUBJECT: GRB160504A: Gemini NIR Observations DATE: 16/05/05 15:38:40 GMT FROM: S. Bradley Cenko at NASA/GSFC S. B. Cenko (NASA/GSFC), A. J. Levan (U. Warwick), N. R. Tanvir (U. Leicester), A. Cucchiara (STScI), and A. Fruchter (STScI) report on behalf of a larger collaboration: We imaged the location of GRB160504A (Malesani et al., GCN 19382) with the Near Infrared Imager and Spectrometer (NIRI) on the 8 m Gemini North telescope beginning at 5:24 UT on 5 May 2016 (~ 9.9 hr after the Swift trigger). A total of 10 min of integration was obtained in each of the J, H, and K filters. Within the enhanced XRT localization (Goad et al., GCN 19386) we identify a single faint source at J2000 coordinates: RA: 11:20:17.18 Dec: +56:00:04.7 Using a nearby point source from 2MASS for calibration, we calculate the following AB magnitudes for this object: J = 23.6 +/- 0.4 H = 23.8 +/- 0.4 K = 23.3 +/- 0.2 Given the faintness of the object, we cannot determine at this time if it associated with GRB160504A.
GCN 19390 table
GRB_name GRB160504A
GCN_number 19390
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19390 SUBJECT: GRB 160504A: Swift/UVOT Upper Limits DATE: 16/05/05 18:34:55 GMT FROM: Mike Siegel at PSU/Swift MOC M. H. Siegel (PSU) and D. Malesani (DARK/NBI) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160504A 99 s after the BAT trigger (Malesani et al., GCN Circ. 19382). No optical afterglow consistent with the XRT position (Goad et al. GCN Circ. 19386) 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) 99 249 147 >20.8 white 99 11822 1316 >21.7 v 587 16542 1317 >20.2 b 513 10910 1145 >21.5 u (fc) 257 507 246 >20.4 u 257 6616 678 >21.2 w1 636 6411 432 >20.4 m2 4571 17443 1275 >21.0 w2 735 12387 963 >21.7 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 19391 table
GRB_name GRB160504A
GCN_number 19391
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19391 SUBJECT: GRB 160504A: RATIR Optical and NIR Observations DATE: 16/05/05 19:17:33 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), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (GSFC/STScI), 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), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (ASU), and Vicki Toy (UMD) report: We observed the field of GRB 160504A (Malesani, et al., GCN 19382) 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 2016/05 5.21 to 2016/05 5.36 UTC (19.64 to 23.11 hours after the BAT trigger), obtaining a total of 2.49 hours exposure in the r and i bands and 1.04 hours exposure in the Z, Y, J, and H bands. For a source within the Swift-XRT error circle (Goad, et al., GCN 19386), in comparison with the SDSS DR9 and 2MASS catalogs, we obtain the following detection and upper limits (3-sigma): r > 23.70 i = 23.62 +/- 0.36 Z > 22.38 Y > 22.08 J > 21.73 H > 21.35 These magnitudes, which appear to be consistent with those reported by Cenko et al., (GCN 19389), 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.
GCN 19393 table
GRB_name GRB160504A
GCN_number 19393
Detection_method Swift-BAT Det
ra 170.0730°
decl 56.0020°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19393 SUBJECT: GRB 160504A: Swift-BAT refined analysis DATE: 16/05/06 03:20:07 GMT FROM: Hans Krimm at NASA-GSFC D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), D. Malesani (DARK/NBI), C. B. Markwardt (GSFC), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team): Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160504A (trigger #685124) (Malesani, et al., GCN Circ. 19382). The BAT ground-calculated position is RA, Dec = 170.073, 56.002 deg which is RA(J2000) = 11h 20m 17.5s Dec(J2000) = +56d 00' 05.7" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 88%. The mask-weighted light curve shows that the main emission starts at T-40 sec, has a very broad profile, peaks near T+0 sec and ends by T+30 sec. T90 (15-350 keV) is 53.9 +- 6.0 sec (estimated error including systematics). We have concluded that a soft spike in the light curve of ~10 msec duration at T-135.5 sec is of instrumental and not astrophysical origin. Our analysis therefore excludes the time before T-135 sec. The time-averaged spectrum from T-42.3 to T+16.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.88 +- 0.20. The fluence in the 15-150 keV band is 7.3 +- 0.9 x 10^-7erg/cm2. The 1-sec peak photon flux measured from T+0.51 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/685124/BA/
GCN 19510 table
GRB_name GRB160504A
GCN_number 19510
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19510 SUBJECT: GRB 160504A: 15 GHz upper limits from AMI DATE: 16/06/08 15:19:48 GMT FROM: Kunal Mooley at Oxford U K. P. Mooley, T. D. Staley, R. P. Fender (Oxford), G. E. Anderson (Curtin), T. Cantwell (Manchester), C. Rumsey, D. Titterington, S. Carey, J. Hickish, Y. C. Perrott, N. Razavi-Ghods, P. Scott (Cambridge), K. Grainge, A. Scaife (Manchester) The AMI Large Array robotically triggered on the Swift alert for GRB 160504A (Malesani et al., GCN 19382) as part of the 4pisky program, and subsequent follow up observations were obtained up to 10 days post-burst. Our observations at 15 GHz on 2016 May 04.85, May 05.88, May 07.82, May 11.90, and May 14.90 (UT) do not reveal any radio source at the XRT location (Goad et al., GCN 19386), with 3sigma upper limits of 93 uJy, 72 uJy, 129 uJy, 123 uJy, and 120 uJy respectively. We thank the AMI staff for scheduling these observations. The AMI-GRB database is a log of all GRB follow up observations with the AMI, and is available at http://4pisky.org/ami-grb/.