GCN Circular 18015
Subject
GRB 150711A: Fermi GBM detection
Date
2015-07-12T02:08:36Z (9 years ago)
From
Peter Jenke at MSFC <peter.a.jenke@nasa.gov>
P. Jenke (UAH) reports on behalf of the Fermi GBM Team:
"At 18:23:00.16 UT on July 11 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 150711A (trigger 458331784/150711766),
which was also detected by
Swift (M. G. Bernardini (INAF-OAB) et al. 2015, GCN 18011).
The GBM on-ground location, using the Fermi GBM trigger
data, is consistent with the Swift/XRT location.
The angle of the burst direction to the Fermi LAT boresight
is 28 degrees.
The GBM light curve is a single peak with a
duration (T90) of about 14s (50-300 keV).
The time-averaged spectrum from T0-13s to T0+19s
is well fit by a power law with an exponential high-energy cutoff.
The power law index is -1.16 +/- 0.07
and the cutoff energy, parameterized as Epeak, is 117 +/- 10 keV.
The event fluence (10-1000 keV) in this time interval is
(2.8 +/- 0.06)E-06 ergs/cm^2. The 1.0-sec peak photon flux measured
starting from T0+4.7s in the 10-1000 keV band
is 4.1 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."