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GCN Circular 35322

Subject

GRB 231210B: Swift-BAT refined analysis

Date

2023-12-11T21:10:59Z (5 months ago)

From

Mike Moss at NASA GSFC <mikejmoss3@gmail.com>

Via

Web form

T. Sakamoto (AGU), 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), K. L. Page (U Leicester)
T. Parsotan (GSFC/UMBC), M. Stamatikos (OSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-36 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 231210B (trigger #1201696)
(Page, et al., GCN Circ. 35314Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 95.803, -48.335 deg which is
   RA(J2000)  =  06h 23m 12.7s
   Dec(J2000) = -48d 20' 04.6"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 17%.
 
The mask-weighted light curve shows a FRED pulse potentially followed by a dimmer spike.
T90 (15-350 keV) is 7.47 +- 0.65 sec (estimated error including systematics).
 
The time-averaged spectrum from T-0.23 to T+7.82 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.08 +- 0.19.  The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06 erg/cm2.
The 1-sec peak photon flux measured from T-0.24 sec in the 15-150 keV band
is 3.9 +- 0.7 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/1201696/BA/