TITLE: GCN CIRCULAR NUMBER: 38015 SUBJECT: GRB 241030A: Fermi GBM Observation DATE: 24/10/31 15:13:27 GMT FROM: Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie> C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 05:48:03.33 UT on 30 October 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB241030A (trigger 751960088/241030242). which was also detected by Swift-BAT (Klingler et al. 2024, GCN 37956), SVOM-GRM (Wang et al. 2024, GCN 37972), and Konus-Wind (Ridnaia et al. 2024, GCN 37982) The Fermi GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 17 degrees. The GBM light curve consists of multiple emission episodes with a duration (T90) of about 166 s (50-300 keV). The time-averaged spectrum from T0-21 to T0+217 s is best fit by a Band function with Epeak = 129 +/- 7 keV, alpha = -1.35 +/- 0.02, and beta = -2.31 +/- 0.08. The event fluence (10-1000 keV) in this time interval is (6.235 +/- 0.095)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+147 s in the 10-1000 keV band is 20 +/- 0.4 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/38015. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...