GCN Circular 11311
Subject
GRB 100924A: Fermi GBM observation
Date
2010-09-28T07:11:07Z (14 years ago)
From
David Gruber at MPE <dgruber@mpe.mpg.de>
David Gruber (MPE) reports on behalf of the Fermi GBM Team:
"At 03:58:08.32 UT on 24 September 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100924A (trigger 306993490 / 100924165).
which was also detected by the Swift-BAT (Mangano et al. 2010, GCN 11294).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 57 degrees.
This burst was also independently detected by INTEGRAL SPI-ACS.
The GBM light curve shows a bright initial peak
with a duration (T90) of about 9.0 +/- 0.4 s (50-300 keV).
Fermi entered the SAA ~ 35 s after the trigger.
Thus, the observation of additional emission episodes,
as reported in Mangano et al. 2010, GCN 11294, was not possible.
The time-averaged spectrum from T0+0.003 s to T0+9.088 s is
best fit by a simple power law function with index -1.59 +0.02/-0.02
(Castor C-STAT 1767 for 725 d.o.f.).
The event fluence (10-1000 keV) in this time interval is
(3.33 +/- 0.04)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.384 s in the 10-1000 keV band
is 7.3 +/- 0.2 ph/s/cm^2.