GCN Circular 39012

A. Y. Lien (U Tampa), S. D. Barthelmy (GSFC), 
R. Gupta (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
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 250114A (trigger #1281241)
(N. J. Klingler, et al., GCN Circ. 38927
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 ).  The BAT ground-calculated position is
RA, Dec = 166.572, -15.129 deg which is 
   RA(J2000)  =  11h 06m 17.3s 
   Dec(J2000) = -15d 07' 44.5" 
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 21%.
 
The mask-weighted light curves display several pulses between T0 and T0+60 sec. 
There are also two additional pulses of emission starting around T0+130 and T0+260.
T90 (15-350 keV) is 293.89 +- 13.45 sec (estimated error including systematics).
 
The time-averaged spectrum from T-8.528 to T+305.988 sec is best fit by a power law
with an exponential cutoff.  This fit gives a photon index 0.39 +- 0.62, 
and Epeak of 50.9 +- 6.3 keV (chi squared 44.16 for 56 d.o.f.).  For this
model the total fluence in the 15-150 keV band is 3.6 +- 0.3 x 10^-06 erg/cm2
and the 1-sec peak flux measured from T+1.72 sec in the 15-150 keV band is
1.5 +- 0.4 ph/cm2/sec.  A fit to a simple power law gives a photon index
of 1.84 +- 0.11 (chi squared 66.05 for 57 d.o.f.).  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/1281241