TITLE: GCN CIRCULAR NUMBER: 44118 SUBJECT: GRB 260326A: Fermi GBM Detection DATE: 26/03/26 11:21:12 GMT FROM: Utkarsh Pathak at IIT Bombay <utkarshpathak.07@gmail.com> U. Pathak (IITB) and S. Bala (USRA) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 01:18:28.51 UT on 26 March 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260326A (trigger 796180713/260326054). The Fermi GBM real-time Localization is reported in GCN 44115. The angle from the Fermi LAT boresight is 76 degrees. The GBM light curve consists of two spikes from a single emission episode with a duration (T90) of about 50 s (50-300 keV). The time-averaged spectrum from T0-6.0 to T0+66.0 s is best fit by a Band function with Epeak = 275 +/- 1 keV, alpha = -1.040 +/- 0.004, and beta = -2.00 +/- 0.01. The event fluence (10-1000 keV) in this time interval is (5.37 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.0 s in the 10-1000 keV band is 32.6 +/- 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/44118. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...