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GCN Circular 38011

Subject

GRB 241030B: Swift-BAT refined analysis

Date

2024-10-31T14:06:42Z (7 days ago)

From

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

Via

legacy email

S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), R. Gupta (GSFC),
N. J. Klingler (GSFC/UMBC/CRESSTII), H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), 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 241030B (trigger #1263840)
(Klingler, et al., GCN Circ. 37981Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 50.787, 34.439 deg which is
   RA(J2000)  =  03h 23m 08.8s
   Dec(J2000) = +34d 26' 21.9"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 11%.
 The mask-weighted light curve shows a single-pulse structure that starts at
T-2 sec, peaks at T+1 sec, and ends at T+9 sec. T90 (15-350 keV) is
6.7 +- 1.6 sec (estimated error including systematics).
 The time-averaged spectrum from T-1.58 to T+7.10 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.40 +- 0.16.  The fluence in the 15-150 keV band is 1.2 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+0.68 sec in the 15-150 keV band
is 3.2 +- 0.6 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/1263840