GRB160622A

This page lists all entries on GRB160622A in GRBweb

Summary GCN 19547 GCN 19548

Summary table
Variable Value Source
T0 2:03:13 UTC GCN_circulars,Swift Det
ra 244.3730° GCN_circulars,Swift Det
decl -51.0450° GCN_circulars,Swift Det
GBM_located False
mjd 57561.08556712963 GCN_circulars,Swift Det
GCN 19547 table
GRB_name GRB160622A
GCN_number 19547
Detection_method Swift Det
t_trigger 2:03:13 UTC
ra 244.3730°
decl -51.0450°
Circular_text TITLE: GCN CIRCULAR NUMBER: 19547 SUBJECT: GRB 160622A: Swift detection of a possible short GRB or a new SGR DATE: 16/06/22 02:38:47 GMT FROM: Caryl Gronwall at PSU/Swift-UVOT A. D'Ai (INAF-IASFPA), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), T. Sakamoto (AGU) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 02:03:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located possible GRB 160622A (trigger=700791). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 244.373, -51.045 which is RA(J2000) = 16h 17m 30s Dec(J2000) = -51d 02' 41" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a short pulse with a duration of about 0.1 sec. The peak count rate was ~4000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 02:04:44.8 UT, 91.1 seconds after the BAT trigger. No source was detected in the 2.5-s promptly available image. We are waiting for the full dataset to detect and localise the XRT counterpart. UVOT took a finding chart exposure of 3 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 25% of the BAT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. Results from the list of sources generated on-board are not available at this time. No correction has been made for the large, but uncertain extinction expected. This source is at a low galactic latitude of -0.37 degrees and may be an SGR. While the BAT lightcurve looks like a short GRB, it is not dissimilar from an SGR. We need the full dataset to determine the nature of this trigger. Burst Advocate for this burst is A. D'Ai (antonino.dai AT ifc.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.)
GCN 19548 table
GRB_name GRB160622A
GCN_number 19548
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 19548 SUBJECT: BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103 DATE: 16/06/22 14:20:36 GMT FROM: Phil Evans at U of Leicester A. D'Ai(INAF-IASFPA), P.Evans (U. Leicester), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), A. Maselli (INAF-IASFPA), T. Sakamoto (AGU) and M. H. Siegel (PSU) report on behalf of the Swift Team: Swift has gathered 5.8 ks of WT mode data and 463 s of PC mode data on the field of the BAT trigger 700791 (= possible GRB 160622A, GCN 19547). The XRT image is dominated by diffuse emission from the supernova remnant RCW 103 (Frank et al., ApJ, 2015, 810,113), with a bright central source at RA,Dec. = 244.40282, -51.03916, which is equivalent to: RA (J2000) = 16h 17m 36.68s Dec (J2000) = -51d 02' 21.0" with an uncertainty of 3.5" (radius, 90% confidence). This is consistent with the catalogued X-ray source 3XMM J161736.1-510224. Analysis is complicated by the presence of the diffuse emission from the SNR, however the source count rate is ~2 ct/sec, with a flux of approximately 9.1 (+2.0, -1.6) × 10^-11 erg cm^-2 s^-1 (derived from a power-law spectrum with NH=7.0 (+3.6, -2.5)e21 cm^-2, and a photon index of 2.2 (+/- 0.4). This is substantially above the 3XMM count rate of 2.567 (+/- 0.020)e-12 erg cm^-2 s^-1. Observations and analysis are ongoing. This circular is an official product of the Swift XRT team. [GCN OPS NOTE(22jun16): Per author's request, A.D'A's name was corrected, and the missing minus sign for the sexagesimal form of the Dec value was added.]