TITLE: GCN CIRCULAR NUMBER: 35754 SUBJECT: GRB 240215A: Fermi GBM Observation DATE: 24/02/18 23:32:17 GMT FROM: Lorenzo Scotton at UAH <lscottongcn@outlook.com> L. Scotton (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 15:33:00.41 UT on 15 February 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240215A (trigger 729703985/240215648), which was also detected by Swift/BAT-GUANO (J. DeLaunay et al. 2024, GCN 35733). The Fermi GBM on-ground location is consistent with the Swift/BAT-GUANO position. The angle from the Fermi LAT boresight is 67 degrees. The GBM light curve consists of a pulse followed by weak emission with a duration (T90) of about 57 s (50-300 keV). The time-averaged spectrum from T0-4.1 to T0+60.4 s is best fit by a simple power law function with index -1.77 +/- 0.06. The event fluence (10-1000 keV) in this time interval is (3.6 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 1.9 +/- 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/35754. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...