GRB241030B: Fermi GBM Observation

"At 18:34:20.39 UT on 30 October 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB241030B (trigger 752006065/241030774). which was also detected by Swift/BAT (N. Klingler et al. 2024, GCN 37981), and SVOM/ECLAIRs (D. Zhao et al. 2024, GCN 37984). The Fermi GBM on-ground location is consistent with the Swift/BAT position. The angle from the Fermi LAT boresight is 54 degrees. The GBM light curve consists of a single bright peak with a duration (T90) of about 6.8 s (50-300 keV). The time-averaged spectrum from T0-1.0 to T0+9.2 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 200 +/- 20 keV. The event fluence (10-1000 keV) in this time interval is (3.2 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.83 s in the 10-1000 keV band is 6.7 +/- 0.2 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak = 190 +/- 26 keV, alpha = -1.03 +/- 0.08 and beta = -2.81 +/- 1. 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/"