TITLE: GCN CIRCULAR NUMBER: 43562 SUBJECT: GRB 260129B: Fermi GBM Final Localization DATE: 26/01/29 19:56:51 GMT FROM: Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com> "The Fermi GBM team reports the detection of a likely Long GRB. At 10:06:57 UT on 29 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260129B (trigger 791374022 / 260129421). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 0.36, Dec = -67.05 (J2000 degrees, equivalent to J2000 00h 01m, -67d 03'), with a statistical uncertainty of 10.6 degrees. The angle from the Fermi LAT boresight is 129.9 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260129421/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/bn260129421/q... The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260129421/q..." View this GCN Circular online at https://gcn.nasa.gov/circulars/43562. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...