GCN Circular 31781
Subject
GRB 220319A: Swift-BAT refined analysis
Date
2022-03-22T15:40:46Z (2 years ago)
From
Sibasish Laha at GSFC <sibasish.laha@nasa.gov>
H. A. Krimm (NSF), S. D. Barthelmy (GSFC),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),
M. Stamatikos (OSU) (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 220319A (trigger #1098132)
(Page et al., GCN Circ. 31769). The BAT ground-calculated position is
RA, Dec = 218.139, 61.291 deg which is
RA(J2000) = 14h 32m 33.4s
Dec(J2000) = +61d 17' 26.6"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 43%.
The BAT light curve showed a single-peaked
structure with a duration of about 10 sec.
T90 (15-350 keV) is 6.44 +- 1.54 sec (estimated error including systematics).
The time-averaged spectrum from T-0.36 to T+6.56 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.15 +- 0.28. The fluence in the 15-150 keV band is 2.3 +- 0.4 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T-0.24 sec in the 15-150 keV band
is 1.5 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/1098132/BA/