GCN Circular 15104
Subject
GRB 130816A: Fermi GBM observation
Date
2013-08-16T21:10:16Z (11 years ago)
From
Gerard Fitzpatrick at UCD <gerard.fitzpatrick@ucdconnect.ie>
G. Fitzpatrick (UCD) and G. Younes (NASA/USRA)
report on behalf of the Fermi GBM Team:
At 01:46:28.52 UT on 16 August 2013, the Fermi Gamma-Ray Burst Monitor
triggered and located the precursor to GRB130816A (trigger
398310391/130816074)
which was detected by the Swift/BAT (Holland et al. 15097, GCN 14527).
The GBM on-ground location is consistent with the Swift position.
The GBM light curve consists of the precursor and the main pulse
with a duration (T90) of about 32 s (50-300 keV).
The time-averaged spectrum from T0+23 s to T0+32 s is
adequately fit by a simple power law function with index -1.83 +/- 0.05.
The event fluence (10-1000 keV) in this time interval is
(1.3 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+27 s in the 10-1000 keV band is 1.9 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog.