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GCN Circular 32931

Subject

GRB 221110A: Swift-BAT refined analysis

Date

2022-11-10T18:59:32Z (2 years ago)

From

Amy Lien at GSFC <amy.y.lien@nasa.gov>

T. Parsotan (GSFC/UMBC), S. D. Barthelmy (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), M. A. Williams (PSU)
(i.e. the Swift-BAT team):

Using the data set from T-240 to T+600 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 221110A (trigger #1136936)
(Williams et al., GCN Circ. 32925Loading...
 
 ).  The BAT ground-calculated position is
RA, Dec = 29.106, -27.298 deg which is
   RA(J2000)  =  01h 56m 25.5s
   Dec(J2000) = -27d 17' 51.4"
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 75%.

The mask-weighted light curve shows a single-pulse structure
that starts at ~T0, peaks at ~T+1 s, and ends at ~T+10 s.
T90 (15-350 keV) is 8.98 +- 2.11 sec (estimated error including
systematics).

The time-averaged spectrum from T-0.41 to T+9.74 sec is best fit
by a simple power-law model.  The power law index of the time-averaged
spectrum is 1.41 +- 0.16.  The fluence in the 15-150 keV band
is 5.1 +- 0.5 x 10^-7 erg/cm2. The 1-sec peak photon flux measured
from T+0.52 sec in the 15-150 keV band is 1.1 +- 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/1136936/BA/