TITLE: GCN CIRCULAR NUMBER: 41333 SUBJECT: GRB 250807B: Swift-BAT refined analysis DATE: 25/08/12 19:39:29 GMT FROM: Mike Moss at NASA GSFC mikejmoss3@gmail.com
S. D. Barthelmy (GSFC), R. Gupta (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-60 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250807B (trigger #1340561) (Klingler, et al., GCN Circ. 41268). The BAT ground-calculated position is RA, Dec = 15.611, -59.098 deg which is RA(J2000) = 01h 02m 26.7s Dec(J2000) = -59d 05' 52.2" with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
The mask-weighted light curve displays a complex structure with several pulses. The T90 (15-350 keV) is 104.17 +- 29.17 sec (estimated error including systematics).
The time-averaged spectrum from T-51.00 to T+85.16 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.12. The fluence in the 15-150 keV band is 2.5 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T-48.59 sec in the 15-150 keV band is 0.9 +- 0.3 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/1340561
View this GCN Circular online at https://gcn.nasa.gov/circulars/41333. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...