Back

GCN Circular 41318

Subject

GRB 250807A: Swift-BAT refined analysis

Event

GRB 250807A

Date

2025-08-11T14:04:39Z (7 days ago)

Edited On

2025-08-12T14:56:23Z (6 days ago)

From

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

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Mike Moss at NASA GSFC <mikejmoss3@gmail.com>

Via

Web form

R. Gupta (GSFC), S. D. Barthelmy (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-240 to T+520 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 250807A (trigger #1340514)
(Klingler, et al., GCN Circ. 41262Loading...
 
 ).  The BAT ground-calculated position is
RA, Dec = 51.435, -47.882 deg which is
   RA(J2000)  =  03h 25m 44.4s
   Dec(J2000) = -47d 52' 54.4"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 72%.
 
The mask-weighted light curve displays a complex structure with several pulses.
T90 (15-350 keV) is 75.46 +- 2.19 sec (estimated error including systematics).
 
The time-averaged spectrum from T-20.35 to T+119.49 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.32 +- 0.03.  The fluence in the 15-150 keV band is 2.5 +- 0.0 x 10^-05 erg/cm2.
The 1-sec peak photon flux measured from T+33.82 sec in the 15-150 keV band
is 16.7 +- 0.5 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/1340514

Previous Circular Next Circular