GCN Circular 424
Subject
GRB991014 BATSE Observations
Date
1999-10-17T01:52:26Z (25 years ago)
From
Timothy Giblin at MSFC <giblin@bowie.msfc.nasa.gov>
T. Giblin, R. M. Kippen (UAH/MSFC), and M. Sahi (USRA/MSFC) report on
behalf of the BATSE Team:
On 1999 October 14.911512 UT, BATSE triggered on GRB991014 (trigger # 7803).
The burst time history shows a primary emission pulse comprised of several
sub-pulses lasting a few seconds followed by a weak and soft pulse. The T90
and T50 measured durations are 4.67 (+/- 0.47) and 1.22 (+/- 0.14) seconds,
respectively. Although short, this burst is still classified as a Class I
burst in the BATSE GRB Hardness-Duration scatter plot. The burst is soft,
with marginal emission above 300 keV and an energy fluence hardness ratio
(100-300 keV / 50-100 keV) equal to 1.36 (+/- 0.13). The 50-300 keV peak
flux of the burst measured on the 64 ms timescale is 2.58 (+/- 0.26)
photons/s/cm^2 and 4.87 (+/- 0.53) ergs/s/cm^2, placing it in the upper
32% of the BATSE peak flux distribution. The fluence (> 25 keV) of the
burst is 1.712 (+/- 0.471) x 10^-6 ergs/cm^2, ranking in the top 58% of
the fluence distribution. The BATSE location is consistent with the
BeppoSAX WFC error circle and IPN annulus. The BATSE light curve will
soon be available at:
http://www.batse.msfc.nasa.gov/~kippen/batserbr/