GRB 130227***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),
E. E. Fenimore (LANL),
N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC),
D. M. Palmer (LANL),
T. Sakamoto (AGU),
G. Sato (ISAS),
M. Stamatikos (OSU),
J. Tueller (GSFC),
T. N. Ukwatta (MSU)
A. Y. Lien (NASA/GSFC/ORAU)
(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 130227***A*** (trigger #549841)
(NAME, et al., GCN Circ. xxxx).  The BAT ground-calculated position is
RA, Dec = 272.158, -20.399 deg which is 
   RA(J2000)  =  18h 08m 38.0s 
   Dec(J2000) = -20d 23' 57.3" 
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
 
[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-0.02 to T+0.04 sec fit by a simple
power-law model shows the power law index of 2.43 +- 0.24 (chi squared 49.54 for 57 d.o.f.).
The fluence in the 15-150 keV band is 2.1 +- 0.3 x 10^-08 erg/cm2.
The 1-sec peak photon flux measured from T-0.49 sec in the 15-150 keV band
is 0.5 +- 0.1 ph/cm2/sec.
 
A single blackbody fit to the time-averaged spectrum shows the blackbody
temperature of 8.24 +- 1.19 keV (chi squared 54.13 for 57 d.o.f.).
A thermal bremsstrahlung model fit shows the temperature of 37.63 +- 11.54 keV
(chi squared 45.70 for 57 d.o.f.).  A double blackbody fit shows the lower temperature
of 3.72 +2.32 keV and the higher temperature of 11.27 (error not unconstrained) keV
(chi squared 45.51 for 55 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/549841/BA/