GCN Circular 17623
Subject
GRB 150323B: Fermi GBM observation
Date
2015-03-23T17:24:20Z (9 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 09:28:39.21 UT on 23 March 2015, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 150323B (trigger 448795722 / 150323395),
which was also detected by the Swift (Cummings et al. 2015, GCN 17619).
The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 69 degrees.
The GBM light curve consists of multiple peaks
with a duration (T90) of about 54 s (50-300 keV).
The time-averaged spectrum from T0-0.512 s to T0+60.929 s is
best fit by a Band function with Epeak = 99.14 (+4.50/-6.02) keV,
alpha = -0.89 (+0.07/-0.05), and beta = -2.04 (+0.03/-0.03).
The event fluence (10-1000 keV) in this time interval is
(2.19 +/- 0.03)E-05 erg/cm^2. The 1.024-sec peak photon flux measured
starting from T0+1.152 s in the 10-1000 keV band
is 8.2 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."