TITLE:   GCN CIRCULAR
NUMBER:  38271
SUBJECT: GRB 241115B: Fermi GBM Observation
DATE:    24/11/18 20:06:33 GMT
FROM:    oindabimukherjee@gmail.com

O. Mukherjee (USRA), S. Bala (USRA) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 18:07:25.97 UT on 15 November 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241115B (trigger 753386850/241115755).
which was also detected by Swift/BAT-NITRATES (Ronchini et al. 2024, GCN 38260).
The Fermi GBM on-ground location was reported in GCN 38241.

The angle from the Fermi LAT boresight is 97 degrees.

The GBM light curve consists of multiple peaks with a duration (T90)
of about 71 s (50-300 keV). The time-averaged spectrum
from T0-8.9 to T0+70.9 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.04 +/- 0.09 and the cutoff energy,
parameterized as Epeak, is 833 +/- 263 keV.

The event fluence (10-1000 keV) in this time interval is
(9.9 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+14 s in the 10-1000 keV band is 3.2 +/- 0.2 ph/s/cm^2.

A Band function fits the spectrum equally well with
Epeak = 780 +/- 272 keV, alpha = -1.03 +/- 0.09 and beta = -2.65 +/- 1.39.

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/"