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GCN Circular 37792

Subject

GRB 241010A: Swift-BAT refined analysis

Date

2024-10-16T00:15:52Z (8 days ago)

From

Mike Moss at NASA GSFC <mikejmoss3@gmail.com>

Via

Web form

D. Sadaula (GSFC/UMBC), S. D. Barthelmy (GSFC),
S. Dichiara (PSU),  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), T. Sakamoto (AGU)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 241010A (trigger #1259578)
(Dichiara, et al., GCN Circ. 37755Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 153.367, 11.544 deg which is
   RA(J2000)  =  10h 13m 28.1s
   Dec(J2000) = +11d 32' 40.1"
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 85%.
 
The mask-weighted light curve shows multiple emission periods. The first period
lasts ~six seconds and displays three pulses, followed by a quiescent period, and
then a second emission period lasting ~15 seconds with two apparent pulses.
T90 (15-350 keV) is 30.86 +- 1.36 sec (estimated error including systematics).
 
The time-averaged spectrum from T-0.04 to T+35.12 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.88 +- 0.08.  The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-06 erg/cm2.
The 1-sec peak photon flux measured from T-0.04 sec in the 15-150 keV band
is 4.3 +- 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/1259578