TITLE: GCN CIRCULAR NUMBER: 38271 SUBJECT: GRB 241115B: Fermi GBM Observation DATE: 24/11/18 20:06:33 GMT FROM: oindabimukherjee@gmail.com O. Mukherjee (USRA), S. Bala (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 18:07:25.97 UT on 15 November 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241115B (trigger 753386850/241115755). which was also detected by Swift/BAT-NITRATES (Ronchini et al. 2024, GCN 38260). The Fermi GBM on-ground location was reported in GCN 38241. The angle from the Fermi LAT boresight is 97 degrees. The GBM light curve consists of multiple peaks with a duration (T90) of about 71 s (50-300 keV). The time-averaged spectrum from T0-8.9 to T0+70.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.04 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 833 +/- 263 keV. The event fluence (10-1000 keV) in this time interval is (9.9 +/- 0.5)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+14 s in the 10-1000 keV band is 3.2 +/- 0.2 ph/s/cm^2. A Band function fits the spectrum equally well with Epeak = 780 +/- 272 keV, alpha = -1.03 +/- 0.09 and beta = -2.65 +/- 1.39. 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/38271. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...