GCN Circular 41396

H. A. Krimm (NSF), S. D. Barthelmy (GSFC), R. Caputo (GSFC), R. Gupta
(GSFC), 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-239 to T+963 sec from the recent telemetry
downlink, we report further analysis of BAT GRB 250814A (trigger #1342439)
(Caputo et al., GCN Circ. 41358
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 ).  The BAT ground-calculated position is
RA, Dec = 306.313, 48.406 deg which is
   RA(J2000)  =  20h 25m 15.2s
   Dec(J2000) = +48d 24' 23.1"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 54%.

The mask-weighted light curve shows a single-pulse structure that starts at
~T0 and peaks at ~T+10 s. The main pulse ends at ~T+25 s, but there is some
weak emission that lasts till ~T+100 s. T90 (15-350 keV) is 110.11 +- 47.90
sec (estimated error including systematics).

The time-averaged spectrum from T+1.06 to T+125.36 sec is best fit by a
simple power-law model.  The power law index of the time-averaged spectrum
is 1.91 +- 0.21.  The fluence in the 15-150 keV band is 1.4 +- 0.2 x 10^-06
erg/cm2. The 1-sec peak photon flux measured from T+10.22 sec in the 15-150
keV band is 0.8 +- 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/1342439