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GCN Circular 33015

Subject

GRB 221202A: Swift-BAT refined analysis

Date

2022-12-03T19:01:10Z (a year ago)

From

Tyler Parsotan at UMBC/GSFC/CRESST II <parsotat@umbc.edu>

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. 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 221202A (trigger #1142997)

(Caputo et al. GCN Circ. 33005Not found
 
 
).  The BAT ground-calculated position is

RA, Dec = 77.002, -59.836 deg which is

   RA(J2000)  =  05h 08m 00.5s

   Dec(J2000) = -59d 50' 09.0"

with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).

The partial coding was 85%.



The mask-weighted light curve shows a single peaked pulse.

T90 (15-350 keV) is 10.34 +- 1.21 sec (estimated error including
systematics).



The time-averaged spectrum from T+1.03 to T+12.44 sec is best fit by a
simple

power-law model.  The power law index of the time-averaged spectrum is

1.64 +- 0.25.  The fluence in the 15-150 keV band is 3.2 +- 0.6 x 10^-07
erg/cm2.

The 1-sec peak photon flux measured from T+3.31 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/1142997/BA/