TITLE: GCN CIRCULAR NUMBER: 44697 SUBJECT: GRB 260522A: Fermi GBM Observation DATE: 26/05/23 00:32:40 GMT FROM: Angus Jameson <abj0023@uah.edu> A. Jameson (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 02:15:08.78 UT on 22 May 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260522A (trigger 801108913/260522094), which was also detected by Fermi-LAT ( et al. 2026, GCN 44689). The Fermi GBM on-ground location is consistent with the Fermi-LAT position. The angle from the Fermi LAT boresight is 10 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 1.8 s (50-300 keV). The time-averaged spectrum from T0-0.7 to T0+0.4 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.48 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 1010 +/- 70 keV. The event fluence (10-1000 keV) in this time interval is (8.1 +/- 0.7)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.51 s in the 10-1000 keV band is 3 +/- 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/44697. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...