TITLE: GCN CIRCULAR NUMBER: 36756 SUBJECT: GRB240624A: Fermi GBM Observation DATE: 24/06/25 07:59:09 GMT FROM: Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie> C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 06:01:11.37 UT on 24 June 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240624A (trigger 740901676/240624251). which was also detected by Swift BAT (N. J. Klingler et al. 2024, GCN 36743). The Fermi GBM on-ground location is consistent with the Swift BAT position. The angle from the Fermi LAT boresight is 83 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 2 s (50-300 keV). The time-averaged spectrum from T0-3.1 to T0+2.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.45 +/- 0.39 and the cutoff energy, parameterized as Epeak, is 90 +/- 13 keV. The event fluence (10-1000 keV) in this time interval is (7.0 +/- 0.8)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.38 s in the 10-1000 keV band is 6 +/- 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/" View this GCN Circular online at https://gcn.nasa.gov/circulars/36756. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...