GCN Circular 39867
Subject
GRB 250322A: Swift-BAT refined analysis
Date
2025-03-25T14:56:16Z (20 hours ago)
From
Rahul Gupta at NASA GSFC <rahulbhu.c157@gmail.com>
Via
Web form
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