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GCN Circular 7604

Subject
GRB 080413A, Swift-BAT refined analysis
Date
2008-04-13T15:58:16Z (16 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
J. Tueller (GSFC), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),
A. P. Beardmore (U Leicester), J. Cummings (GSFC/UMBC), E. Fenimore (LANL),
N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
K. McLean (GSFC/UMD), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
 
Using the data set from T-239 to T+454 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 080413A (trigger #309096)
(Beardmore, et al., GCN Circ. 7594).  The BAT ground-calculated position is
RA, Dec = 287.301, -27.677 deg, which is 
   RA(J2000)  =  19h 09m 12.1s 
   Dec(J2000) = -27d 40' 36.8" 
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 81%.
 
The mask-weighted light curve shows four peaks.  The first starting at T-0.1 sec,
peaking at T+2.0 sec.  The second peak overlaps with the first and peaks
at ~T+7 sec.  The third and fourth peaks are well separated with peaks
at T+16 and T+47 sec, repsectively.  The lightcurve returns to baseline
at ~T+80 sec.  T90 (15-350 keV) is 46 +- 1 sec (estimated error
including systematics).
 
The time-averaged spectrum from T-0.1 to T+50.3 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.57 +- 0.06.  The fluence in the 15-150 keV band is 3.5 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+1.64 sec in the 15-150 keV band
is 5.6 +- 0.2 ph/cm2/sec.  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/309096/BA/
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