TITLE:   GCN CIRCULAR
NUMBER:  38510
SUBJECT: GRB 241207B: Fermi GBM Observation
DATE:    24/12/10 01:28:08 GMT
FROM:    Lorenzo Scotton at UAH <lscottongcn@outlook.com>

L. Scotton (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:

"At 20:51:01.75 UT on 07 December 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241207B (trigger 755297466/241207869)
which was also detected by Swift/BAT-NITRATES (DeLaunay et al. 2024, GCN 38472).
The Fermi GBM on-ground location is consistent with the Swift/BAT-NITRATES position.

The angle from the Fermi LAT boresight is 64 degrees.

The GBM light curve consists of a single emission episode with a duration (T90)
of about 0.3 s (50-300 keV). The time-averaged spectrum
from T0-0.2 to T0+0.4 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.7 +/- 0.2 and the cutoff energy,
parameterized as Epeak, is 344 +/- 110 keV.

The event fluence (10-1000 keV) in this time interval is
(3.8 +/- 0.6)E-07 erg/cm^2. The 64-ms peak photon flux measured
starting from T0+0.0 s in the 10-1000 keV band is 7 +/- 1 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/"