TITLE: GCN CIRCULAR NUMBER: 35360 SUBJECT: GRB 231214A: Fermi GBM observation DATE: 23/12/15 18:56:47 GMT FROM: sumanbala2210@gmail.com S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 20:24:24.68 UT on 14 December 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 231214A (trigger 724278269 / 231214850), which was also detected by the Swift/BAT (Brivio et al. 2023, GCN 35335), Fermi-LAT (Kocevski et al. 2023, GCN 35342) and AstroSat CZTI (Navaneeth et al. GCN 35348). The Fermi GBM Final Real-time Localization (GCN 35334) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 50.0 degrees. The GBM light curve consists of two distinct peaks with a duration (T90) of about 21 s (50-300 keV). The time-averaged spectrum from T0-0.5 s to T0+26.1 s is best fit by a Band function with Epeak = 142.5 +/- 5 keV, alpha = -0.46 +/- 0.05, and beta = -2.5 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (2.25 +/- 0.05)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+16.12 s in the 10-1000 keV band is 22.24 +/- 1.77 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/35360. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...