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GCN Circular 38010

Subject

GRB 241030A: Swift-BAT refined analysis

Date

2024-10-31T13:57:08Z (13 hours ago)

From

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

Via

legacy email

H. A. Krimm (NSF), S. D. Barthelmy (GSFC), R. Gupta (GSFC),
N. J. Klingler (GSFC/UMBC/CRESSTII), 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-240 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 241030A (trigger #1263718)
(Klingler, et al., GCN Circ. 37956Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 343.216, 80.438 deg which is
   RA(J2000)  =  22h 52m 51.9s
   Dec(J2000) = +80d 26' 18.2"
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 80%.
 The mask-weighted light curve shows multiple emission periods. The initial episode
starts from T0 following four overlapping pulses, and ends around T+45 sec. Then,
the bright episode starts at T+105 sec, peaks at T+148 sec, and ends at T+230 sec.
T90 (15-350 keV) is 173.3 +- 5.0 sec (estimated error including systematics).
 The time-averaged spectrum from T-0.86 to T+276.48 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.64 +- 0.03.  The fluence in the 15-150 keV band is 2.73 +- 0.04 x 10^-5 erg/cm2.
The 1-sec peak photon flux measured from T+147.45 sec in the 15-150 keV band
is 11.8 +- 0.3 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/1263718