TITLE: GCN CIRCULAR NUMBER: 38011 SUBJECT: GRB 241030B: Swift-BAT refined analysis DATE: 24/10/31 14:06:42 GMT FROM: Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp> S. Laha (GSFC/UMBC), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 241030B (trigger #1263840) (Klingler, et al., GCN Circ. 37981). The BAT ground-calculated position is RA, Dec = 50.787, 34.439 deg which is RA(J2000) = 03h 23m 08.8s Dec(J2000) = +34d 26' 21.9" with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 11%. The mask-weighted light curve shows a single-pulse structure that starts at T-2 sec, peaks at T+1 sec, and ends at T+9 sec. T90 (15-350 keV) is 6.7 +- 1.6 sec (estimated error including systematics). The time-averaged spectrum from T-1.58 to T+7.10 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.16. The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.68 sec in the 15-150 keV band is 3.2 +- 0.6 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/1263840 View this GCN Circular online at https://gcn.nasa.gov/circulars/38011. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...