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GCN Circular 35386

Subject

GRB 231215A: Swift-BAT refined analysis

Date

2023-12-17T04:59:08Z (10 months ago)

From

Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>

Via

legacy email

S. D. Barthelmy (GSFC), P. D'Avanzo (INAF-OAB), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
M. Moss (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 231215A (trigger #1202522)
(D'Avanzo, et al., GCN Circ. 35343Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 9.730, 57.634 deg which is
   RA(J2000)  =  00h 38m 55.1s
   Dec(J2000) = +57d 38' 00.8"
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 6%.
 The mask-weighted light curve shows a structure of several overlapping pulses.
The emission starts from T-10 s, peaks at T0 and ends at T+20 s.
T90 (15-350 keV) is 20.75 +- 3.69 sec (estimated error including systematics).
 The time-averaged spectrum from T-7.04 to T+19.79 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.01 +- 0.09.  The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-5 erg/cm2.
The 1-sec peak photon flux measured from T+0.18 sec in the 15-150 keV band
is 9.6 +- 1.4 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/1202522/BA/