GRB 240313***A***: Swift-BAT refined analysis
 
<somebody goes first>
<add the BA alphabetically>
S. D. Barthelmy (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),
T. Sakamoto (AGU)
(i.e. the Swift-BAT team):
 
Using the data set from T-239 to T+423 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 240313***A*** (trigger #1219916)
(NAME, et al., GCN Circ. xxxx).  The BAT ground-calculated position is
RA, Dec = 255.226, -38.118 deg which is 
   RA(J2000)  =  17h 00m 54.2s 
   Dec(J2000) = -38d 07' 03.1" 
with an uncertainty of 3.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 80%.
 
[Description about the mask-weighted light curve]
T90 (15-350 keV) is 0.81 +- 0.23 sec (estimated error including systematics).
 
The time-averaged spectrum from T-131.58 to T-130.74 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.73 +- 0.75.  The fluence in the 15-150 keV band is 2.3 +- 1.1 x 10^-08 erg/cm2.
The 1-sec peak photon flux measured from T-131.66 sec in the 15-150 keV band
is 0.3 +- 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/1219916