GCN Circular 4873
Subject
GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
Date
2006-03-13T05:43:42Z (18 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
C. Markwardt (GSFC/UMD), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/NRC), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/NRC), G. Sato (ISAS),
J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-60 to T+123 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 060313 (trigger #201487)
(Pagani, et al., GCN 4867). The BAT ground-calculated position is RA,Dec =
66.624,-10.859 deg {04h 26m 29.8s,-10d 51' 30.9"} (J2000) +- 1.0 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 54%.
The lightcurve shows 3 or 4 overlapping peaks. They start with a very fast
rise (less than 40 msec). There is a possibility of further faint emission
past the end of the last peak (T+1 to T+2 sec). T90 (15-350 keV) is
0.7 +- 0.1 sec (estimated error including systematics).
The time-averaged spectrum from T+0.06 to T+0.94 is best fit by a simple
power-law model. The power law index of the time-averaged spectrum
is 0.71 +- 0.07. The fluence in the 15-150 keV band is
1.13 +- 0.05 x 10^-6 erg/cm2. The 1-sec peak photon flux measured
from T+0.01 sec in the 15-150 keV band is 12.1 +- 0.4 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.