GCN Circular 14442
Subject
GRB 130425A: Fermi GBM detection
Date
2013-04-25T15:24:49Z (11 years ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 07:51:16.23 UT on 25 April 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 130425A (trigger 388569079 / 130425327).
The on-ground calculated location, using the GBM trigger data,
is RA = 19.0, DEC = -72.2 (J2000 degrees, equivalent
to 01 h 16 m, -72 d 12 '), with an uncertainty of 2.9 degrees
(radius, 1-sigma containment, statistical only; there is additionally
a systematic error which is currently estimated to be 2 to 3 degrees).
The angle from the Fermi LAT boresight is 150 degrees.
The GBM light curve shows two peaks with a duration (T90)
of about 66 s (50-300 keV). The time-averaged spectrum from
T0-2.880 s to T0+69.825 s is best fit by a power law function
with an exponential high-energy cutoff. The power law index
is -1.28 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 254
(+14/-13) keV.
The event fluence (10-1000 keV) in this time interval is
(5.2 +/- 0.1)E-05 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+43.5207 s in the 10-1000 keV band
is 21.8 +/- 1.1 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."