GCN Circular 37887
Subject
GRB 241025C: Fermi GBM Detection
Date
2024-10-25T22:41:22Z (8 days ago)
From
Lorenzo Scotton at UAH <lscottongcn@outlook.com>
Via
Web form
L. Scotton (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 15:36:10.66 UT on 25 October 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241025C (trigger 751563375/241025650).
The GBM on-ground calculated location was reported in GCN Circular 37883.
The angle from the Fermi LAT boresight is 75 degrees.
The GBM light curve consists of a single emission episode with a duration (T90)
of about 5 s (50-300 keV). The time-averaged spectrum
from T0-3.0 to T0+3.2 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.68 +/- 0.13 and the cutoff energy,
parameterized as Epeak, is 103 +/- 7 keV.
The event fluence (10-1000 keV) in this time interval is
(1.71 +/- 0.08)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.26 s in the 10-1000 keV band is 9.7 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well with
Epeak = 102 +/- 10 keV, alpha = -0.68 +/- 0.15 and beta = -3.68 +/- 2.34.
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/"