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GCN Circular 7786

Subject

GRB 080602, Swift-BAT refined analysis

Date

2008-06-02T22:31:48Z (16 years ago)

From

Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>

G. Sato (GSFC/ISAS), 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),
M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
 
Using the data set from T-296 to T+302 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 080602 (trigger #312958)
(Beardmore, et al., GCN Circ. 7781Not found
 
 
).  The BAT ground-calculated position is
RA, Dec = 19.177, -9.239 deg, which is 
   RA(J2000)  =  01h 16m 42.6s 
   Dec(J2000) = -09d 14' 19.8" 
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 19%.
 
The mask-weighted light curve shows 4 or 5 peaks, the first starting at ~T-25 sec,
the second at ~T-15 sec, the 3rd at ~T-5 sec, peaking at ~T+1 sec and 
ending at ~T+15 sec; the 4th starts at ~T+55 sec and ends at ~T+65 sec.
T90 (15-350 keV) is 74 +- 7 sec (estimated error including systematics).
 
The time-averaged spectrum from T-11.5 to T+69.3 sec is best fit by a simple
power-law model.  The power law index of the time-averaged spectrum is
1.43 +- 0.13.  The fluence in the 15-150 keV band is 3.2 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+59.60 sec in the 15-150 keV band
is 2.9 +- 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/312958/BA/