GCN Circular 29793
Subject
GRB 210410A: Swift-BAT refined analysis
Date
2021-04-11T14:53:46Z (3 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC),
J. R. Cummings (CPI), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC),
A. Melandri (INAF-OAB), 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 210410A (trigger #1042113)
(Melandri et al., GCN Circ. 29778). The BAT ground-calculated position is
RA, Dec = 269.741, 45.359 deg which is
RA(J2000) = 17h 58m 57.8s
Dec(J2000) = +45d 21' 31.9"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 55%.
The mask-weighted light curve shows a FRED pulse that starts at ~T0, peaks
at ~T0, peaks at ~T+2 s, and ends at ~T+100 s. T90 (15-350 keV)
is 52.88 +- 4.15 sec (estimated error including systematics).
The time-averaged spectrum from T-0.00 to T+66.06 sec is best fit by a
simple
power-law model. The power law index of the time-averaged spectrum is
1.04 +- 0.06. The fluence in the 15-150 keV band is 5.6 +- 0.2 x 10^-6
erg/cm2.
The 1-sec peak photon flux measured from T+1.74 sec in the 15-150 keV band
is 4.0 +- 0.3 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/1042113/BA/