TITLE: GCN CIRCULAR NUMBER: 43939 SUBJECT: GRB 260307A: Fermi GBM Final Localization DATE: 26/03/07 13:08:25 GMT FROM: A. Holzmann Airasca at University of Trento and INFN Bari <a.holzmannairasca@unitn.it> The Fermi GBM team reports the detection of a likely LONG GRB "At 11:27:59.32 UT on 07 March 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260307A (trigger 794575684/260307478). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 209.07, Dec = 29.03 (J2000 degrees, equivalent to J2000 13h 56m, 29d 01'), with a statistical uncertainty of 2.88 degrees. The angle from the Fermi LAT boresight is 77 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260307478/q... The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260307478/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260307478/q..." View this GCN Circular online at https://gcn.nasa.gov/circulars/43939. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...