TITLE: GCN CIRCULAR NUMBER: 36875 SUBJECT: GRB 240715A: Fermi GBM Observation DATE: 24/07/15 17:01:42 GMT FROM: Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie> C. de Barra (UCD) and C. Meegan (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: At 05:44:03.26 UT on 15 July 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240715A (trigger 742715048/240715239). The Final Real-time Localization was reported previously (Fermi GBM Team 2024, GCN 36866). The angle from the Fermi LAT boresight is 75 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 0.16 s (50-300 keV). The time-averaged spectrum from T0-0.06 to T0+0.19 is is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.82 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 2323 +/- 232 keV. The spectrum is equally well fit by a Band function with Epeak = 2275 +/- 267 keV, alpha = -0.82 +/- 0.03 and beta = -3.86 +/- 1.75. The event fluence (10-1000 keV) in this time interval is (2.9 +/- 0.9)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.064 s in the 10-1000 keV band is 47 +/- 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/36875. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...