TITLE: GCN CIRCULAR NUMBER: 42058 SUBJECT: GRB 251001B: Swift-BAT refined analysis DATE: 25/10/02 20:10:01 GMT FROM: Mike Moss at NASA GSFC <mikejmoss3@gmail.com> H. A. Krimm (NSF), S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester), R. Gupta (GSFC), 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+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 251001B (trigger #1400467) (Beardmore, et al., GCN Circ. 42039). The BAT ground-calculated position is RA, Dec = 42.668, -22.990 deg which is RA(J2000) = 02h 50m 40.2s Dec(J2000) = -22d 59' 23.9" with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 91%. The mask-weighted light curve shows a single FRED pulse from ~T0-5 s to ~T0+20 s. Statistically significant emission is found to occur out to ~T0+90 s. The T90 (15-350 keV) is 75.33 +- 46.90 sec (estimated error including systematics). The time-averaged spectrum from T-9.98 to T+91.72 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.49 +- 0.14. The fluence in the 15-150 keV band is 1.1 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+2.29 sec in the 15-150 keV band is 0.8 +- 0.1 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/1400467 View this GCN Circular online at https://gcn.nasa.gov/circulars/42058. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...