GCN Circular 4879
Subject
GRB 060313: Further analysis of the Swift-BAT bright short hard burst
Date
2006-03-14T00:11:51Z (18 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
S. Barthelmy (GSFC), J. Cummings (GSFC/NRC), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), J. Norris (GSFC), T. Sakamoto (GSFC/NRC),
D. Palmer (LANL
on behalf of the Swift-BAT team:
Using the data set from T-300 to T+300 sec from additional telemetry
downlinks, we report further analysis of BAT GRB 060313 (trigger #201487)
(Pagani, et al., GCN 4867; Markwardt, et al., 4873). This short burst
does not show any sign of extended emission in the T+1 to T+300 sec range
at an upper limit of 0.001 cnt/detector/sec. This corresponds to a
flux ratio upper limit between the initial peak and the peak of any
potential extended emission of 2000. We reference SHBs 050724 and 051227
which had ratios of 46 and ~10, respectively.
The lag analysis shows this burst to be cleanly in the short hard burst class
(Norris and Bonnell, 2006, ApJ, accepted; see, Figure 3).
Specifically, the measured lags are:
50-100 keV to 15-25 keV: 0.8 ms +- 0.6 ms
100-350 keV to 25-50 keV: 0.3 ms +- 0.7 ms
We further note that the lightcurve has multiple structures. There are
at least 20 statistically significant peaks with FWHM in the 5-15 msec range.
There is no perdiodic structure in the lightcurve for at least
the first 100 sec.