GCN Circular 22952
Subject
GRB 180715A: Fermi GBM detection
Date
2018-07-16T04:35:23Z (6 years ago)
From
Rachel Hamburg at UAH <rkh0007@uah.edu>
R. Hamburg (UAH) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 18:07:05.06 UT on 15 July 2018, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 180715A (trigger 553370830 / 180715755)
which was also detected by the Swift/BAT (Ukwatta et al. 2018, GCN 22947).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 75
degrees.
The GBM light curve shows a single structured peak
with a duration (T90) of about 0.7 s (50-300 keV).
The time-averaged spectrum from T0-0.19 to T+0.51 s is
adequately fit by a power law function with an exponential
high-energy cutoff. The power law index is -0.14 +/- 0.21 and
the cutoff energy, parameterized as Epeak, is 852 +/- 182 keV.
The event fluence (10-1000 keV) in this time interval is
(1.7 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured
starting from T0-0.064s in the 10-1000 keV band
is 8.4 +/- 1.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."