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GCN Circular 6724

Subject
GRB 070808, Swift-BAT refined analysis
Date
2007-08-09T03:38:55Z (17 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <jayc@milkyway.gsfc.nasa.gov>
E. Fenimore (LANL), L. Barbier (GSFC), S. D. Barthelmy (GSFC),
J. Cummings (GSFC/UMBC), N. Gehrels (GSFC), H. Krimm (GSFC/USRA), 
C. Markwardt (GSFC/UMD), D. Palmer (LANL), A. Parsons (GSFC),
T. Sakamoto (GSFC/ORAU), G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU),
J. Tueller (GSFC), T. Ukwatta (GWU)
 
Using the data set from T-120 to T+218 sec from the recent telemetry 
downlink, we report further analysis of BAT GRB 070808 (trigger #287260)
(Cummings, et al., GCN Circ. 6718).  The BAT ground-calculated position 
is RA, Dec = 6.761, 1.180 deg which is 
   RA(J2000) = 0h 27m 2.6s 
   Dec(J2000) = 1d 10' 47" 
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 47%.
 
The burst had a single FRED peak. T90 (15-350 keV) was 32 +- 3 sec 
(estimated error including systematics).
 
The time-averaged spectrum from T-0.7 to T+41.4 sec is best fit by a 
simple power-law model.  The power law index of the time-averaged 
spectrum is 1.47 +- 0.14.  The fluence in the 15-150 keV band was 
1.2 +- 0.1 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from 
T+0.73 sec in the 15-150 keV band was 2.0 +- 0.2 ph/cm2/sec.  All the 
quoted errors are at the 90% confidence level.
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