GCN Circular 33874
Subject
GRB 230524A: Fermi GBM Observation
Date
2023-05-25T10:00:14Z (a year ago)
From
Andreas von Kienlin at MPE <azk@mpe.mpg.de>
A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 06:06:35 UT on 24 May 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 230524A (trigger 706601200/230524255),
which was also detected by AGILE (Panebianco et al. 2023, GCN 33867)
and AstroSAT/CZTI (Navaneeth et al. 2022, GCN 33868).
The Fermi GBM Final Real-time Localization was reported in GCN 33864.
The GBM light curve consists of a single emission with a duration (T90)
of about 35 s (50-300 keV). The time-averaged spectrum
from T0-2.0 to T0+36.9 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.99 +/- 0.04 and the cutoff energy,
parameterized as Epeak, is 1632 +/- 415 keV.
The event fluence (10-1000 keV) in this time interval is
(1.58 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0-2 s in the 10-1000 keV band is 2.7 +/- 0.2 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/"