GCN Circular 7736
Subject
GRB 080516, Swift-BAT refined analysis
Date
2008-05-16T10:40:50Z (16 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
H. Krimm (GSFC/USRA), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
S. T. Holland (CRESST/USRA/GSFC), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD),
D. Palmer (LANL), T. Sakamoto (GSFC/UMBC), G. Sato (GSFC/ISAS),
M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC), T. Ukwatta (GWU)
(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 080516 (trigger #311762)
(Holland, et al., GCN Circ. 7733). The BAT ground-calculated position is
RA, Dec = 120.661, -26.146 deg, which is
RA(J2000) = 08h 02m 38.7s
Dec(J2000) = -26d 08' 46.9"
with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 38%.
The mask-weighted light curve shows two well separated peaks. The first peak
starts at T-0.1 sec, peaks at T+0.3 sec, and ends at T+1.0 sec. The second
peak starts at T+3.5 sec, peaks at T+5.5 sec, and ends at T+7.5 sec.
T90 (15-350 keV) is 5.8 +- 0.3 sec (estimated error including systematics).
The time-averaged spectrum from T+0.1 to T+6.1 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.82 +- 0.27. The fluence in the 15-150 keV band is 2.6 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T+0.05 sec in the 15-150 keV band
is 1.8 +- 0.3 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/311762/BA/