TITLE: GCN CIRCULAR NUMBER: 45138 SUBJECT: GRB 260710A: Fermi GBM Detection DATE: 26/07/11 11:40:47 GMT FROM: Marianna Dafčíková at Masaryk University <500025@mail.muni.cz> M. Dafcikova (MUNI) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 12:58:43.52 UT on 10 July 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260710A (trigger 805381128/260710541). The Final real-time localization was reported in GCN 45131. The GBM light curve consists of a single peak with a duration (T90) of about 1.9 s (50-300 keV). The time-averaged spectrum from T0-0.16 to T0+1.94 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.93 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 139 +/- 3 keV. The event fluence (10-1000 keV) in this time interval is (2.17 +/- 0.09)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.38 s in the 10-1000 keV band is 30 +/- 3 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 98 +/- 3 keV, alpha = -0.71 +/- 0.02 and beta = -2.00 +/- 0.07. 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/45138. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...