TITLE: GCN CIRCULAR NUMBER: 45467 SUBJECT: GRB 260829A: Fermi GBM Detection DATE: 26/08/29 14:12:23 GMT FROM: Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com> C. Malacaria (INAF-OAR) reports on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 06:08:09.39 UT on 29 August 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260829A (trigger 809676494/260829256). The Final real-time localization was reported in GCN 45464. The GBM light curve consists of a prompt emission followed by a bright peak with a duration (T90) of about 26.4 s (50-300 keV). The time-averaged spectrum from T0+18 to T0+34 s is best fit by a Band function with Epeak = 260 +/- 10 keV, alpha = -0.66 +/- 0.04, and beta = -2.17 +/- 0.08. The event fluence (10-1000 keV) in this time interval is (1.91 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+22 s in the 10-1000 keV band is 19.1 +/- 0.3 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/45467. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...