GCN Circular 15300
Subject
GRB 131002A: Fermi GBM observation
Date
2013-10-04T15:44:29Z (11 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 06:55:06.99 UT on 2 October 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 131002A (trigger 402389709 / 131002288) which
was also detected by the Swift/BAT (Barlow et al. 2008, GCN 15283). GBM
triggered ~46 sec later than Swift/BAT on the second pulse of the GRB.
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 128.2 degrees.
The GBM light curve shows a single pulse with a duration (T90) of
about 12 s (50-300 keV). The time-averaged spectrum from T0-4.096 s to
T0+4.096 s is
well fit by a simple power law function with index -1.6 +/- 0.1 keV.
The event fluence (10-1000 keV) in this time interval is
(1.4 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0 -2.1 s in the 10-1000 keV band
is 2.1 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."