GRB 250726***A***: Swift-BAT refined analysis
 
<somebody goes first>
<add the BA alphabetically>
S. D. Barthelmy (GSFC), 
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),
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 250726***A*** (trigger #1337165)
(NAME, et al., GCN Circ. xxxx).  The BAT ground-calculated position is
RA, Dec = 251.753, -45.884 deg which is 
   RA(J2000)  =  16h 47m 00.7s 
   Dec(J2000) = -45d 53' 02.2" 
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 57%.
 
[Description about the mask-weighted light curve]
T90 (15-350 keV) is 0.05 +- 0.01 sec (estimated error including systematics).
 
The time-averaged spectrum from T+0.00 to T+0.06 sec fit by a simple
power-law model shows the power law index of 3.25 +- 0.27 (chi squared 86.25 for 57 d.o.f.).
The fluence in the 15-150 keV band is 1.2 +- 0.3 x 10^-08 erg/cm2.
The 1-sec peak photon flux measured from T-0.47 sec in the 15-150 keV band
is 0.5 +- 0.2 ph/cm2/sec.
 
A single blackbody fit to the time-averaged spectrum shows the blackbody
temperature of 8.08 +- 0.82 keV (chi squared 53.60 for 57 d.o.f.).
A thermal bremsstrahlung model fit shows the temperature of 25.75 +- 5.43 keV
(chi squared 67.85 for 57 d.o.f.).  A double blackbody fit shows the lower temperature
of 0.17 (error not unconstrained) keV and the higher temperature of 8.08 +0.82 keV
(chi squared 53.60 for 55 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/1337165