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GCN Circular 34964

GRB 231104A: Swift-BAT refined analysis
2023-11-08T01:28:51Z (6 months ago)
Sibasish Laha at GSFC <>
M. Stamatikos (OSU), 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),(i.e. the Swift-BAT team):

Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 231104A (trigger #1194500)
(Page et al., GCN Circ. 34938).  The BAT ground-calculated position is
RA, Dec = 23.824, 83.794 deg which is
   RA(J2000)  =  01h 35m 17.8s
   Dec(J2000) = +83d 47' 38.7"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 89%.

The BAT  light curve shows a complex structure with a duration of ~ 80 sec.
T90 (15-350 keV) is 46.77 +- 1.54 sec (estimated error including systematics).

The time-averaged spectrum from T-13.39 to T+55.84 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.24 +- 0.03.  The fluence in the 15-150 keV band is 1.3 +- 0.0 x 10^-05 erg/cm2.
The 1-sec peak photon flux measured from T+0.24 sec in the 15-150 keV band
is 24.8 +- 0.6 ph/cm2/sec.  All the quoted errors are at the 90% confidence

The results of the batgrbproduct analysis are available at

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