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/"
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