TITLE: GCN CIRCULAR NUMBER: 41748 SUBJECT: GRB 250905A: Swift-BAT refined analysis DATE: 25/09/08 15:16:06 GMT FROM: D. R. Sadaula at NASA GSFC <dev.r.sadaula@nasa.gov> T. Parsotan (GSFC), S. D. Barthelmy (GSFC), 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), 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 250905A (trigger #1347265) (Brivio, et al., GCN Circ. 41714). The BAT ground-calculated position is RA, Dec = 232.943, 0.789 deg which is RA(J2000) = 15h 31m 46.3s Dec(J2000) = +00d 47' 19.6" with an uncertainty of 3.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 74%. The BAT light curve showed a complex structure with multiple peaks. The burst lasted about 70 sec. T90 (15-350 keV) is 48.00 +- 50.60 sec (estimated error including systematics). The time-averaged spectrum from T-15.10 to T+64.89 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.65 +- 0.67. The fluence in the 15-150 keV band is 4.1 +- 1.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T+8.40 sec in the 15-150 keV band is 0.27 +- 0.16 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/1347265 View this GCN Circular online at https://gcn.nasa.gov/circulars/41748. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...