TITLE: GCN CIRCULAR NUMBER: 40765 SUBJECT: GRB 250615A: Swift-BAT refined analysis DATE: 25/06/18 02:48:55 GMT FROM: Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp> S. D. Barthelmy (GSFC), S. Dichiara (PSU), R. Gupta (GSFC), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250615A (trigger #1324646) (Dichiara, et al., GCN Circ. 40736). The BAT ground-calculated position is RA, Dec = 290.384, 4.679 deg which is RA(J2000) = 19h 21m 32.1s Dec(J2000) = +04d 40' 44.0" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 56%. The mask-weighted light curve shows a complex structure that starts at T-5 sec, peaks at T+5 sec, and ends at T+77 sec. T90 (15-350 keV) is 52.5 +- 10.3 sec (estimated error including systematics). The time-averaged spectrum from -5.2 to 77.3 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.22 +- 0.08. The fluence in the 15-150 keV band is 3.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+3.29 sec in the 15-150 keV band is 4.1 +- 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/1324646 View this GCN Circular online at https://gcn.nasa.gov/circulars/40765. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...