TITLE:   GCN CIRCULAR
NUMBER:  38285
SUBJECT: GRB 241120A: Fermi GBM Observation
DATE:    24/11/20 20:31:12 GMT
FROM:    rhamburg@usra.edu

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

"At 05:53:58.54 UT on 20 November 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241120A (trigger 753774843/241120246),
which was also detected by INTEGRAL/IBAS (Gotz et al. 2024, GCN 38280).
The Fermi GBM on-ground location is consistent with the INTEGRAL position.

The angle from the Fermi LAT boresight is about 39 degrees.

The GBM light curve consists of a single emission episode with a duration (T90)
of about 3.2 s (50-300 keV). The time-averaged spectrum
from T0-0.5 to T0+3.3 s is best fit by a Band function with 
Epeak = 181 +/- 13, alpha = -0.3 +/- 0.1, and beta = -2.4 +/- 0.2.

The event fluence (10-1000 keV) in this time interval is
(3.6 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.7 s in the 10-1000 keV band is 12.3 +/- 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/"