GCN Circular 37917
Subject
GRB 241026A Fermi GBM Analysis
Date
2024-10-28T00:42:41Z (4 days ago)
From
atrigg2@lsu.edu
Via
Web form
A. Trigg (LSU) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 22:42:31.28 UT on 26 October 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241026A (trigger 751675356/241026946).
which was also detected by Swift BAT (D. M. Palmer et al. 2024, GCN 37896)
and Einstein Probe (D.Y. Li et al. 2024, GCN 37909).
The Fermi GBM on-ground location is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 43 degrees.
The GBM light curve consists of a single emission episode with a duration (T90)
of about 16 s (50-300 keV). The time-averaged spectrum
from T0+0.003 to T0+16.768 s is best fit by
a Comptonized function with a power law index -0.96 +/- 0.05 and a cutoff energy,
parameterized as Epeak, is 229 +/- 20.
The event fluence (10-1000 keV) in this time interval is
(6.6 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.70 s in the 10-1000 keV band is 7.1 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well with
Epeak = 183 +/- 22 keV, alpha = -0.87 +/- 0.07 and beta = -2.17 +/- 0.2.
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/"