GCN Circular 32328
Subject
GRB 220701A: Swift-BAT refined analysis
Date
2022-07-06T13:57:34Z (2 years ago)
From
Hans Krimm at NSF/NASA-GSFC <hkrimm@nsf.gov>
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), P. A. Evans (U Leicester),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),
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 220701A (trigger #1114034)
(Evans, et al., GCN Circ. 32306). The BAT ground-calculated position is
RA, Dec = 242.474, 55.436 deg which is
RA(J2000) = 16h 09m 53.7s
Dec(J2000) = +55d 26' 08.9"
with an uncertainty of 2.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 56%.
The BAT mask-weighted light curve shows a fairly weak peak extending from
Roughly T-2 to T+8 seconds. T90 (15-350 keV) is 5.77 +- 1.13 sec (estimated
error including systematics).
The time-averaged spectrum from T-1.40 to T+4.83 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.37 +- 0.34. The fluence in the 15-150 keV band is 1.8 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+3.65 sec in the 15-150 keV band
is 0.7 +- 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/1114034/BA/