TITLE: GCN CIRCULAR NUMBER: 41318 SUBJECT: GRB 250807A: Swift-BAT refined analysis DATE: 25/08/11 14:04:39 GMT FROM: Mike Moss at NASA GSFC mikejmoss3@gmail.com

R. Gupta (GSFC), S. D. Barthelmy (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), 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+520 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250807A (trigger #1340514) (Klingler, et al., GCN Circ. 41262). The BAT ground-calculated position is RA, Dec = 51.435, -47.882 deg which is RA(J2000) = 03h 25m 44.4s Dec(J2000) = -47d 52' 54.4" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 72%.

The mask-weighted light curve displays a complex structure with several pulses. T90 (15-350 keV) is 75.46 +- 2.19 sec (estimated error including systematics).

The time-averaged spectrum from T-20.35 to T+119.49 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.32 +- 0.03. The fluence in the 15-150 keV band is 2.5 +- 0.0 x 10^-05 erg/cm2. The 1-sec peak photon flux measured from T+33.82 sec in the 15-150 keV band is 16.7 +- 0.5 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/1340514

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