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GCN Circular 15092

Subject
GRB 130812A, Swift-BAT refined analysis
Date
2013-08-13T16:12:20Z (11 years ago)
From
Takanori Sakamoto at AGU <tsakamoto@phys.aoyama.ac.jp>
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),
J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):

Using the data set from T-144 to T+431 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 130812A (trigger #566228)
(D'Elia, et al., GCN Circ. 15088).  The BAT ground-calculated position is
RA, Dec = 92.387, -13.285 deg which is 
  RA(J2000)  =  06h 09m 32.8s 
  Dec(J2000) = -13d 17' 06.6" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 75%.

The mask-weighted light curve shows multiple spikes peaking at T0, T0+4 sec and T0+7 sec.  
T90 (15-350 keV) is 7.6 +- 0.5 sec (estimated error including systematics).

The time-averaged spectrum from T-0.3 to T+8.5 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
2.52 +- 0.11.  The fluence in the 15-150 keV band is 5.9 +- 0.3 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.14 sec in the 15-150 keV band
is 2.8 +- 0.2 ph/cm2/sec.  All the quoted errors are at the 90% confidence
level. 

The results of the batgrbproduct analysis will be available at
http://gcn.gsfc.nasa.gov/notices_s/566228/BA/
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