TITLE: GCN CIRCULAR NUMBER: 39867 SUBJECT: GRB 250322A: Swift-BAT refined analysis DATE: 25/03/25 14:56:16 GMT FROM: Rahul Gupta at NASA GSFC rahulbhu.c157@gmail.com
D. Sadaula (GSFC/UMBC), 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), T. Parsotan (GSFC), 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 250322A (trigger #1297832) (Gupta, et al., GCN Circ. 39835). The BAT ground-calculated position is RA, Dec = 106.775, 7.197 deg which is RA(J2000) = 07h 07m 06.1s Dec(J2000) = +07d 11' 47.8" with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted BAT light curve shows multi-peak emission. T90 (15-350 keV) is 0.62 +- 0.05 sec (estimated error including systematics).
The time-averaged spectrum from T+0.00 to T+0.67 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 0.65 +- 0.19. The fluence in the 15-150 keV band is 1.5 +- 0.2 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.16 sec in the 15-150 keV band is 1.4 +- 0.2 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/1297832
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