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GCN Circular 33194

Subject
GRB 230116D: Swift-BAT refined analysis
Date
2023-01-18T22:24:27Z (a year ago)
From
Sibasish Laha at GSFC <sibasish.laha@nasa.gov>
C. B. Markwardt (GSFC),S. D. Barthelmy (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), 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-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 230116D (trigger #1149293)
(Sonbas et al., GCN Circ. 33176).  The BAT ground-calculated position is
RA, Dec = 98.584, 49.831 deg which is
   RA(J2000)  =  06h 34m 20.1s
   Dec(J2000) = +49d 49' 50.3"
with an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 98%.

The BAT light curve showed a complex structure with a duration of about 40 sec.
T90 (15-350 keV) is 41.00 +- 11.18 sec (estimated error including systematics).

The time-averaged spectrum from T+1.14 to T+53.144 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.38 +- 0.22.  The fluence in the 15-150 keV band is 8.12 +- 1.2 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T+12.14 sec in the 15-150 keV band
is 0.6 +- 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/1149293/BA/
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