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/" View this GCN Circular online at https://gcn.nasa.gov/circulars/38285. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...