TITLE: GCN CIRCULAR NUMBER: 44942 SUBJECT: GRB 260614B: Fermi GBM Observation DATE: 26/06/14 21:57:48 GMT FROM: Eva M. Palafox at INAOE <eva.palafox@gmail.com> E. Palafox (INAOE-Mexico) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 13:49:53.52 UT on 14 June 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260614B (trigger 803137798/260614576). which was also detected by SVOM/ECLAIRs (Godet et al. 2026, GCN 44938). The Fermi GBM on-ground location is consistent with the SVOM/ECLAIRs position. The angle from the Fermi LAT boresight is 31 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 30 s (50-300 keV). The time-averaged spectrum from T0-13 to T0+34 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.78 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 510 +/- 10 keV. The event fluence (10-1000 keV) in this time interval is (2.20 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+13 s in the 10-1000 keV band is 5.7 +/- 0.2 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/44942. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...