GRB 050915***A***, Swift-BAT refined analysis
 
<somebody goes first>
<add the BA alphabetically>
S. D. Barthelmy (GSFC), 
W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA),
A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC),
D. M. Palmer (LANL),
T. Sakamoto (AGU),
M. Stamatikos (OSU),
T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
 
Using the data set from T-299 to T+303 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 050915***A*** (trigger #155284)
(NAME, et al., GCN Circ. xxxx).  The BAT ground-calculated position is
RA, Dec = 219.121, -67.406 deg which is 
   RA(J2000)  =  14h 36m 28.9s 
   Dec(J2000) = -67d 24' 20.9" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 53%.
 
[Description about the mask-weighted light curve]
T90 (15-350 keV) is 43.1 +- 4.4 sec (estimated error including systematics).
 
The time-averaged spectrum from T-9.1 to T+56.9 sec is best fit by a power law
with an exponential cutoff.  This fit gives a photon index 1.37 +- 0.27, 
and Epeak of 59.4 +- 11.0 keV (chi squared 62.11 for 56 d.o.f.).  For this
model the total fluence in the 15-150 keV band is 3.4 +- 0.1 x 10^-06 erg/cm2
and the 1-sec peak flux measured from T-3.08 sec in the 15-150 keV band is
2.3 +- 0.2 ph/cm2/sec.  A fit to a simple power law gives a photon index
of 1.89 +- 0.06 (chi squared 73.62 for 57 d.o.f.).  All the quoted errors
are at the 90% confidence level. 
 
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/155284/BA/