GRB160525B

This page lists all entries on GRB160525B in GRBweb

Summary IPN Swift GCN 19459 GCN 19460 GCN 19463 GCN 19465 GCN 19466 GCN 19467 GCN 19468 GCN 19469 GCN 19470 GCN 19475 GCN 19564

Summary table
Variable Value Source
T0 9:25:07 UTC GCN_circulars,Swift Det
ra 149.3846° Swift
decl 51.2066° Swift
pos_error 1.94e-04° Swift
T90 0.29 s Swift
T90_start 9:25:07 UTC Swift
fluence 3.20e-08 erg/cm² Swift
T100 0.29 s
GBM_located False
mjd 57533.39244212963 GCN_circulars,Swift Det
IPN table
GRB_name GRB160525B
ra 149.4417°
decl 51.1833°
pos_error 5.00e-02°
Swift table
GRB_name GRB160525B
t_trigger 9:25:07 UTC
ra 149.3846°
decl 51.2066°
pos_error 1.94e-04°
T90 0.29 s
fluence 3.20e-08 erg/cm²
GCN 19459 table
GRB_name GRB160525B
GCN_number 19459
Detection_method Swift Det
t_trigger 9:25:07 UTC
ra 149.4430°
decl 51.1800°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19459 SUBJECT: GRB 160525B: Swift detection of a burst DATE: 16/05/25 09:34:47 GMT FROM: David Palmer at LANL H. A. Krimm (CRESST/GSFC/USRA), S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA), P.A. Evans (U Leicester), C. Gronwall (PSU), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Swift Team: At 09:25:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 160525B (trigger=687522). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 149.443, +51.180 which is RA(J2000) = 09h 57m 46s Dec(J2000) = +51d 10' 49" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak structure with a duration of about 10 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 09:26:31.0 UT, 83.4 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 149.38688, 51.20658 which is equivalent to: RA(J2000) = 09h 57m 32.85s Dec(J2000) = +51d 12' 23.7" with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 158 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. No spectrum from the promptly downlinked event data is yet available to determine the column density. UVOT took a finding chart exposure of 150 seconds with the White filter starting 88 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 H. A. Krimm (hans.krimm 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.)
GCN 19460 table
GRB_name GRB160525B
GCN_number 19460
Detection_method Swift-XRT Other
ra 149.3845°
decl 51.2064°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19460 SUBJECT: GRB 160525B: Prompt enhanced Swift-XRT position DATE: 16/05/25 10:50:45 GMT FROM: Phil Evans at U of Leicester P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Using 1.9 ks of promptly downlinked XRT event data for GRB 160525B, we find an enhanced XRT position of the afterglow: RA, Dec: 149.3845, 51.2064 which is equivalent to: RA (J2000) = 09 57 32.28 Dec (J2000) = +51 12 23.0 with an uncertainty of 2.1 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/687522. Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular is an official product of the Swift-XRT team.
GCN 19463 table
GRB_name GRB160525B
GCN_number 19463
Detection_method Swift-XRT Det
ra 149.3846°
decl 51.2066°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19463 SUBJECT: GRB 160525B: Enhanced Swift-XRT position DATE: 16/05/25 15:29:40 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 1923 s of XRT Photon Counting mode data and 2 UVOT images for GRB 160525B, 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 = 149.38464, +51.20657 which is equivalent to: RA (J2000): 09h 57m 32.31s Dec (J2000): +51d 12' 23.7" with an uncertainty of 1.6 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 19465 table
GRB_name GRB160525B
GCN_number 19465
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19465 SUBJECT: GRB 160525B: Swift/UVOT Detection DATE: 16/05/25 20:09:20 GMT FROM: Massimiliano de Pasquale at IASF-Palermo M. De Pasquale, N.P. Kuin (UCL-MSSL) and H. A. Krimm (CRESST/GSFC/USRA) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 160525B 88 s after the BAT trigger (Krimm et al., GCN Circ. 19459). A source consistent with the XRT position (Evans GCN Circ. 19460) is detected in the initial UVOT white filter exposure. 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 88 238 147 19.8 +/- 0.3 white 581 1894 284 >20.9 v 631 1945 156 >18.9 b 556 1870 136 >19.8 u 300 2018 379 >20.0 w1 680 1996 156 >19.5 m2 1603 1795 39 >18.2 w2 606 1573 58 >18.9 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). -- Dr. Massimiliano De Pasquale Research associate - Swift UVOT scientist Mullard Space Science Laboratory, University College London
GCN 19466 table
GRB_name GRB160525B
GCN_number 19466
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19466 SUBJECT: GRB 160525B: Nanshan optical upper limit DATE: 16/05/25 21:32:53 GMT FROM: Dong Xu at NAOC/CAS D. Xu, Y.-H. Han (both NAOC/CAS), S.-G. Ma, A. Esamdin, J.-Z. Liu, L. Ma (all XAO) report: We observed the field of GRB 160525B (Krimm et al., GCN 19459) using the 1m telescope located at Nanshan, Xinjiang, China. We obtained 5x300s R-band frames, starting at 15:26:24 UT on 2016-05-25, i.e., 6.02 hr after the burst. No optical source is detected at the XRT position (Beardmore et al., GCN 19463) in the stacked image, down to a limiting magnitude of m(R)>21.5, calibrated with the nearby SDSS field.
GCN 19467 table
GRB_name GRB160525B
GCN_number 19467
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19467 SUBJECT: GRB 160525B: Swift-XRT refined Analysis DATE: 16/05/25 21:57:33 GMT FROM: Phil Evans at U of Leicester V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), L.M. McCauley (PSU), J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and H.A. Krimm report on behalf of the Swift-XRT team: We have analysed 6.3 ks of XRT data for GRB 160525B (Krimm et al. GCN Circ. 19459), from 91 s to 18.0 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 19460). The light curve can be modelled with a power-law decay with a decay index of alpha=1.27 (+/-0.10). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.91 (+0.26, -0.24). The best-fitting absorption column is 6.0 (+6.5, -5.1) x 10^20 cm^-2, consistent with the Galactic value of 8.3 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 (3.9 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 6.0 (+6.5, -5.1) x 10^20 cm^-2 Galactic foreground: 8.3 x 10^19 cm^-2 Excess significance: <1.6 sigma Photon index: 1.91 (+0.26, -0.24) If the light curve continues to decay with a power-law decay index of 1.27, the count rate at T+24 hours will be 2.6 x 10^-4 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.8 x 10^-15 (10.0 x 10^-15) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00687522. This circular is an official product of the Swift-XRT team.
GCN 19468 table
GRB_name GRB160525B
GCN_number 19468
Detection_method Swift-BAT Det
ra 149.4380°
decl 51.1970°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19468 SUBJECT: GRB 160525B: Swift-BAT refined analysis DATE: 16/05/26 04:07:57 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), 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+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 160525B (trigger #687522) (Krimm, et al., GCN Circ. 19459). The BAT ground-calculated position is RA, Dec = 149.438, 51.197 deg, which is RA(J2000) = 09h 57m 45.2s Dec(J2000) = +51d 11' 48.9" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 81%. The mask-weighted light curve shows weak emission starting at ~T-1 sec, the main emission from ~T0 to ~T+0.3 sec, and weak emission out to ~T+0.6 sec. T90 (15-350 keV) is 0.29 +- 0.05 sec (estimated error including systematics). The time-averaged spectrum from T+0.02 to T+0.33 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.89 +- 0.35. The fluence in the 15-150 keV band is 3.2 +- 0.8 x 10^-8 erg/cm2. The 1-sec peak photon flux measured from T-0.32 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/687522/BA/
GCN 19469 table
GRB_name GRB160525B
GCN_number 19469
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19469 SUBJECT: GRB 160525B: Khureltogot optical upper limit DATE: 16/05/26 18:06:16 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), S. Schmalz (ISON), A. Volnova (IKI), N. Tungalag (Research Center of Astronomy and Geophysics MAS), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the GRB 160525B (Krimm et al., GCN 19459) with ORI-40 telescope of Khureltogot observatory starting on May, 25 (UT) 15:51:26. We do not detect any source within enhanced Swift-XRT position (Beardmore et al., GCN 19463). Preliminary photometry of the combined image is following Date UT start t-T0 Filter Exp. UpperLimit (3 sigma) (mid, days) (s) 2016-05-25 15:51:26 0.29070 clear 60*60 21.0 Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R: SDSS-DR9_id R(Lupton) J095742.79+511301.4 16.17 J095737.78+511402.4 16.43 J095736.76+511019.5 14.87 J095730.61+510914.1 17.74 J095737.35+510856.0 15.01
GCN 19470 table
GRB_name GRB160525B
GCN_number 19470
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 19470 SUBJECT: GRB 160525B: Mondy optical upper limit DATE: 16/05/26 18:08:31 GMT FROM: Alexei Pozanenko at IKI, Moscow E. Mazaeva (IKI), E. Klunko (ISTP), A. Volnova (IKI), I. Korobtsev (ISTP), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration: We observed the field of the GRB 160525B (Krimm et al., GCN 19459) with AZT-33IK telescope of Sayan observatory (Mondy) starting on May, 25 (UT) 15:54:47. We do not detect any source within enhanced Swift-XRT position (Beardmore et al., GCN 19463). Preliminary photometry of the combined image is following Date UT start t-T0 Filter Exp. UpperLimit (3 sigma) (mid, days) (s) 2016-05-25 15:54:47 0.29111 R 30*120 22.6 Photometry is based on nearby SDSS-DR9 stars, Lupton transformations into R: SDSS-DR9_id R(Lupton) J095742.79+511301.4 16.17 J095737.78+511402.4 16.43 J095736.76+511019.5 14.87 J095730.61+510914.1 17.74 J095737.35+510856.0 15.01
GCN 19475 table
GRB_name GRB160525B
GCN_number 19475
Detection_method MITSuME
Circular_text TITLE: GCN CIRCULAR NUMBER: 19475 SUBJECT: GRB 160525B: MITSuME Akeno optical upper limits DATE: 16/05/31 10:05:57 GMT FROM: Taketoshi Yoshii at Tokyo Tech K. Saisho, Y. Muraki, Y. Ono, T. Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, Y. Yano, S. Harita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We searched for the optical counterpart of GRB 160525B (H. A. Krimm et al., GCN Circular #19459) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2016-05-25 10:03:51 UT (~0.65 h after the burst). We did not find any new point source within XRT circle in all three bands. We obtained following limits for the magnitudes. T0+[hour] MID-UT T-EXP[sec] g' Rc Ic ---------------------------------------------------------------------------- 0.65 15:58:53 1140 >18.6 >18.2 >17.6 ---------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.
GCN 19564 table
GRB_name GRB160525B
GCN_number 19564
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 19564 SUBJECT: GRB 160525B: 15 GHz upper limits from AMI DATE: 16/06/24 12:53:04 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 160525B (Krimm et al., GCN 19459) 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 25.55, May 26.66, May 28.66, and May 31.68 (UT) do not reveal any radio source at the XRT location (Beardmore et al., GCN 19463), with 3sigma upper limits of 99 uJy, 63 uJy, 66 uJy, and 96 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/.