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GCN Circular 13007

GRB 120305A: Swift-BAT refined analysis
2012-03-06T00:10:00Z (12 years ago)
Scott Barthelmy at NASA/GSFC <>
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA),
C. B. Markwardt (GSFC), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU),
G. Stratta (ASDC), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 120305A (trigger #516997)
(Stratta, et al., GCN Circ. 13004).  The BAT ground-calculated position is
RA, Dec = 47.549, 28.495 deg which is 
   RA(J2000)  =  03h 10m 11.8s 
   Dec(J2000) = +28d 29' 41.2" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 92%.
The mask-weighted light curve shows a single FRED-like spike starting
at ~T+0.00 sec, peaking at ~T+0.02 sec, and returning to baseline
at ~T+0.20 sec.  At the ~2-sigma level, there is possible emission out to ~T+20 sec.
T90 (15-350 keV) is 0.10 +- 0.02 sec (estimated error including systematics).
The time-averaged spectrum from T+0.00 to T+0.136 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.00 +- 0.09.  The fluence in the 15-150 keV band is 2.0 +- 0.1 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.43 sec in the 15-150 keV band
is 2.2 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence
The results of the batgrbproduct analysis are available at
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