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GCN Circular 14779

Subject
GRB 130604A: Swift-BAT refined analysis
Date
2013-06-06T12:26:59Z (11 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (NASA/GSFC/ORAU),
C. B. Markwardt (GSFC), A. Melandri (INAF-OAB), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU)
(i.e. the Swift-BAT team):
 
Using the data set from T-240 to T+962 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 130604A (trigger #557354)
(Melandri, et al., GCN Circ. 14752).  The BAT ground-calculated position is
RA, Dec = 250.166, 68.225 deg, which is 
   RA(J2000)  =  16h 40m 39.9s 
   Dec(J2000) = +68d 13' 28.4" 
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 81%.
 
The mask-weighted light curve shows a FRED-like peak starting at ~T-1 sec,
peaking at ~T+10 sec, and ending at ~T+90 sec.
T90 (15-350 keV) is 37.7 +- 4.6 sec (estimated error including systematics).
 
The time-averaged spectrum from T-0.44 to T+43.58 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.51 +- 0.12.  The fluence in the 15-150 keV band is 1.4 +- 0.1 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+14.39 sec in the 15-150 keV band
is 0.8 +- 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/557354/BA/
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