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GCN Circular 37971

Subject

GRB 241026A: Swift-BAT refined analysis

Date

2024-10-30T13:52:37Z (3 months ago)

From

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

Via

legacy email

S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
A. Melandri (INAF-OAR), M. J. Moss (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC), D. Sadaula (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 241026A (trigger #1262764)
(Melandri, et al., GCN Circ. 37896Loading...
 
 ).  The BAT ground-calculated position is
RA, Dec = 293.425, 57.996 deg which is
   RA(J2000)  =  19h 33m 41.9s
   Dec(J2000) = +57d 59' 46.7"
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 17%.
 The mask-weighted light curve shows a single-pulse structure that starts at
T-2 s, peaks at T0 s, and ends at T+31 s.  T90 (15-350 keV) is 25.2 +- 5.6 sec
(estimated error including systematics).
 The time-averaged spectrum from T-1.34 to T+30.98 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.56 +- 0.12.  The fluence in the 15-150 keV band is 2.5 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-0.29 sec in the 15-150 keV band
is 4.0 +- 0.5 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level.
 The results of the batgrbproduct analysis are available at
https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1262764