GCN Circular 42315

Subject

GRB 251014D: Swift-BAT refined analysis

Event

GRB 251014D

Date

2025-10-16T23:04:28Z (5 days ago)

From

Rahul Gupta at NASA GSFC <rahul.gupta@nasa.gov>

Via

Web form

D. M. Palmer (LANL), 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), 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 251014D (trigger #1404126)
(Klingler, et al., GCN Circ. 42274Loading...
 
 ).  The BAT ground-calculated position is
RA, Dec = 323.933, -41.873 deg which is 
   RA(J2000)  =  21h 35m 43.9s 
   Dec(J2000) = -41d 52' 23.0" 
with an uncertainty of 2.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 49%.
 
The mask-weighted BAT light curve shows a main emission followed by weaker 
emission. T90 (15-350 keV) is 286.98 +- 70.09 sec (estimated error including 
systematics).
 
The time-averaged spectrum from T+0.39 to T+310.10 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.74 +- 0.38.  The fluence in the 15-150 keV band is 1.0 +- 0.2 x 10^-06 erg/cm2.
The 1-sec peak photon flux measured from T+5.18 sec in the 15-150 keV band
is 0.5 +- 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/1404126