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GCN Circular 30514

Subject
GRB 210725A: Swift-BAT refined analysis
Date
2021-07-25T20:06:04Z (3 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
M. G. Bernardini (INAF-OAB), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), T. N. Ukwatta (LANL)
(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 210725A (trigger #1061511)
(Bernardini et al., GCN Circ. 30501).  The BAT ground-calculated position is
RA, Dec = 215.381, -1.177 deg which is
   RA(J2000)  =  14h 21m 31.4s
   Dec(J2000) = -01d 10' 37.2"
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 92%.

The mask-weighted light curve shows a multi-peaked structure that
starts at ~T0 and ends at ~T+60 s. The main peak occurs at ~T+1 s.
T90 (15-350 keV) is 53.54 +- 11.25 sec (estimated error including
systematics).

The time-averaged spectrum from T-0.82 to T+59.86 sec is best fit
by a simple power-law model.  The power law index of the time-averaged
spectrum is 1.42 +- 0.32.  The fluence in the 15-150 keV band
is 8.1 +- 1.2 x 10^-7 erg/cm2. The 1-sec peak photon flux measured
from T+1.01 sec in the 15-150 keV band is 1.0 +- 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/1061511/BA/
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