TITLE: GCN CIRCULAR NUMBER: 41081 SUBJECT: GRB 250628A: Swift-BAT refined analysis DATE: 25/07/13 20:59:21 GMT FROM: Takanori Sakamoto at AGU tsakamoto@phys.aoyama.ac.jp
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), M. Ferro (INAF-OAB), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (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 250628A (trigger #1328546) (Ferro, et al., GCN Circ. 40853). The BAT ground-calculated position is RA, Dec = 38.539, -38.082 deg which is RA(J2000) = 02h 34m 09.3s Dec(J2000) = -38d 04' 54.3" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 51%.
The mask-weighted light curve shows a double-peak structure that starts at ~T-9 s, peaks at ~T+1 s, and ends at ~T+70 s. T90 (15-350 keV) is 64 +- 11 sec (estimated error including systematics).
The time-averaged spectrum from T-9.42 to T+68.56 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.99 +- 0.12. The fluence in the 15-150 keV band is 1.9 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.10 sec in the 15-150 keV band is 1.2 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1328546
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