{
  "circularId": 43562,
  "createdOn": 1769716611315,
  "submitter": "Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com>",
  "submittedHow": "web",
  "body": "\"The Fermi GBM team reports the detection of a likely Long GRB.\n\nAt 10:06:57 UT on 29 Jan 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located \nGRB 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.\n\nThe skymap can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260129421/quicklook/glg_skymap_all_bn260129421.png\n\nThe HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260129421/quicklook/glg_healpix_all_bn260129421.fit\n\nThe GBM light curve can be found here:\nhttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260129421/quicklook/glg_lc_medres34_bn260129421.gif\"",
  "bibcode": "2026GCN.43562....1F",
  "format": "text/plain",
  "eventId": "GRB 260129B",
  "subject": "GRB 260129B: Fermi GBM Final Localization"
}