GCN Circular 14429
Subject
GRB 130420A: Fermi GBM observation
Date
2013-04-21T04:44:55Z (11 years ago)
From
Shaolin Xiong at UAH <sx0002@uah.edu>
Shaolin Xiong (UAH) and Arne Rau (MPE)
report on behalf of the Fermi GBM Team:
"At 07:30:19.92 UT on 20 April 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 130420A (trigger 388135822 / 130420313),
which was also detected by the Swift (Page et al. 2013, GCN 14406).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 134 degrees.
The GBM light curve consists of precursors and a bright peak
with a duration (T90) of about 102 s (50-300 keV).
The time-averaged spectrum from T0-10 s to T0+27 s is
adequately fit by a power law function with an exponential
high-energy cutoff. The power law index is 1.00 +/- 0.13 and
the cutoff energy, parameterized as Epeak, is 56 +/- 3 keV.
The event fluence (10-1000 keV) in this time interval is
(1.4 +/- 0.05)E-5 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+2.0 s in the 10-1000 keV band
is 5.2 +/- 0.4 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."