TITLE: GCN CIRCULAR NUMBER: 44808 SUBJECT: GRB 260603B: Fermi GBM Final Localization DATE: 26/06/03 18:16:31 GMT FROM: Eva M. Palafox at INAOE <eva.palafox@gmail.com> The Fermi GBM team reports the detection of a likely LONG GRB "At 16:44:46.61 UT on 03 June 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260603B (trigger 802197891/260603698). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 350.27, Dec = 39.20 (J2000 degrees, equivalent to J2000 +23h 21m, +39d 12'), with a statistical uncertainty of 3.16 degrees. The angle from the Fermi LAT boresight is 63 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260603698/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/bn260603698/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260603698/q..." View this GCN Circular online at https://gcn.nasa.gov/circulars/44808. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...