GCN Circular 37996
Subject
GRB241030B: Fermi GBM Observation
Date
2024-10-31T01:44:21Z (a month ago)
From
oindabimukherjee@gmail.com
Via
Web form
O. Mukherjee (USRA), S. Dalessi (UAH), S. Bala (USRA) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 18:34:20.39 UT on 30 October 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB241030B (trigger 752006065/241030774).
which was also detected by Swift/BAT (N. Klingler et al. 2024, GCN 37981),
and SVOM/ECLAIRs (D. Zhao et al. 2024, GCN 37984).
The Fermi GBM on-ground location is consistent with the Swift/BAT position.
The angle from the Fermi LAT boresight is 54 degrees.
The GBM light curve consists of a single bright peak with a duration (T90)
of about 6.8 s (50-300 keV). The time-averaged spectrum
from T0-1.0 to T0+9.2 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.04 +/- 0.07 and the cutoff energy,
parameterized as Epeak, is 200 +/- 20 keV.
The event fluence (10-1000 keV) in this time interval is
(3.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.83 s in the 10-1000 keV band is 6.7 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well with
Epeak = 190 +/- 26 keV, alpha = -1.03 +/- 0.08 and beta = -2.81 +/- 1.
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/"