TITLE: GCN CIRCULAR NUMBER: 36499 SUBJECT: GRB 240516A: Fermi GBM Observation DATE: 24/05/16 22:55:10 GMT FROM: sumanbala2210@gmail.com S. Bala (USRA), S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 03:36:24.84 UT on 16 May 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240516A (trigger 737523389/240516150). which was also detected by Swift BAT (T. M. Parsotan et al. 2024, GCN 36493). The Fermi GBM on-ground location is consistent with the Swift BAT position. The angle from the Fermi LAT boresight is 47 degrees. The GBM light curve consists of a single emission episode with a duration (T90) of about 46 s (50-300 keV). The time-averaged spectrum from T0+1.0 to T0+45.1 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.69 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 528 +/- 72 keV. The event fluence (10-1000 keV) in this time interval is (1.12 +/- 0.06)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.7 s in the 10-1000 keV band is 2.4 +/- 0.2 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak= 490 +/- 107 keV, alpha = -0.7 +/- 0.1 and beta = -2.1 +/- 0.3. 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/36499. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...