GCN Circular 37705
Subject
GRB 241002A: Swift-BAT refined analysis
Date
2024-10-03T20:18:43Z (5 months ago)
From
Mike Moss at NASA GSFC <mikejmoss3@gmail.com>
Via
Web form
T. Sakamoto (AGU), S. D. Barthelmy (GSFC),
R. Caputo (GSFC), R. Gupta (GSFC),
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)
(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 241002A (trigger #1257556)
(Caputo, et al., GCN Circ. 37662). The BAT ground-calculated position is
RA, Dec = 140.942, 39.829 deg which is
RA(J2000) = 09h 23m 46.1s
Dec(J2000) = +39d 49' 44.5"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 69%.
The mask-weighted light curve shows an overall single pulse of emission with
several smaller pulses of emission that can be seen during the main emission.
The T90 (15-350 keV) is 46.81 +- 10.52 sec (estimated error including systematics).
The time-averaged spectrum from T-21.34 to T+44.86 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.02 +- 0.10. The fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-06 erg/cm2.
The 1-sec peak photon flux measured from T-0.29 sec in the 15-150 keV band
is 1.7 +- 0.2 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/1257556