GCN Circular 33222
Subject
GRB 230124A: Fermi GBM Observation
Date
2023-01-26T01:00:42Z (2 years ago)
From
Sarah Dalessi at UAH <sd0104@uah.edu>
S. Dalessi (UAH) and C.Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 15:18:46.70 UT on 24 January 2023, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 230124A (trigger 696266331 / 230124638)
which was also detected by the Swift/BAT-GUANO (J. A. Kennea et al.
2023, GCN 33220).
The Fermi GBM Final Real-time Localization was reported in GCN 33215.
The angle from the Fermi LAT boresight at the GBM trigger time is 32 degrees.
The GBM light curve consists of a single peak
with a duration (T90) of about 12 s (50-300 keV).
The time-averaged spectrum from T0-2.56 s to T0+12.8 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.36 +/- 0.13 and
the cutoff energy, parameterized as Epeak, is 77.41 +/- 3.34 keV.
The event fluence (10-1000 keV) in this time interval is
(2.248 +/- 0.077)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+7.1 s in the 10-1000 keV band
is 4.6 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"