TITLE:   GCN CIRCULAR
NUMBER:  37464
SUBJECT: GRB 240910A: Fermi GBM Observation
DATE:    24/09/12 01:55:19 GMT
FROM:    Matt Godwin <msg0028@uah.edu>

M. Godwin (UAH) reports on behalf of the Fermi GBM Team:

"At 04:00:44.21 UT on 10 September 2024, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 240910A (trigger 747633649 / 240910167) which was also detected by the 
Swift/BAT (A. D'ai et al. 2024, GCN 37461) and GOTO (Julakanti et al., 2024, GCN 37459).
The GBM on-ground location is consistent with the Swift position.

The angle from the Fermi LAT boresight at the GBM trigger time is 101 degrees.


The GBM light curve consists of multiple peaks with a duration (T90)
of about 272 s (50-300 keV). The time-averaged spectrum
from T0+0 to T0+272.4 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.23 +/- 0.05 and the cutoff energy,
parameterized as Epeak, is 125 +/- 9 keV.

The event fluence (10-1000 keV) in this time interval is
(1.911 +/- 0.073)E-05 erg/cm^2. The 1s peak photon flux measured
starting from T0+86.1s in the 10-1000 keV band is 6.1 +/- 0.3 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/"