GCN Circular 20913
Subject
GRB 170318B: Fermi GBM observation
Date
2017-03-18T20:28:15Z (7 years ago)
From
Peter Veres at UAH <veresp@gmail.com>
P. Veres and C. Meegan (both UAH)
report on behalf of the Fermi GBM Team:
"At 15:27:53.09 UT on 18 March 2018, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 170318B (trigger 511543678 / 170318644).
which was also detected by the Swift/BAT
(Cholden-Brown et al. 2008, GCN 20908)
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 93 degrees.
The GBM light curve shows a single peak
with a duration (T90) of about 4 s (50-300 keV).
The time-averaged spectrum from T0-3.3 s to T0+1.8 s is
adequately fit by a simple power law function with index -1.40 +/- 0.10.
The event fluence (10-1000 keV) in this time interval is
(8.0 +/- 1.4)E-7 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-0.8 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."