TITLE:   GCN CIRCULAR
NUMBER:  46281
SUBJECT: GRB 261113B: Fermi GBM Final Localization
DATE:    26/11/14 23:55:19 GMT
FROM:    rhamburg@usra.edu

The Fermi GBM team reports the detection of a likely LONG GRB.

"At 19:45:55.10 UT on 13 November 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 261113B (trigger 816291960/261113824).This trigger was initially classified as Distant Particles by the flight software, but is in fact a GRB.

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 168.2, Dec = 42.4 (J2000 degrees, equivalent to J2000 11h 12m 43.2s, +42d 21'), with a statistical uncertainty of 2.76 degrees.

The angle from the Fermi LAT boresight is 147 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261113824/quicklook/glg_skymap_all_bn261113824.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261113824/quicklook/glg_healpix_all_bn261113824.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261113824/quicklook/glg_lc_medres34_bn261113824.gif"