TITLE:   GCN CIRCULAR
NUMBER:  45910
SUBJECT: GRB 261011B: Fermi GBM Final Localization
DATE:    26/10/11 21:40:10 GMT
FROM:    Eva MP at INAOE <eva.palafox@gmail.com>

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

"At 17:26:50.57 UT on 11 October 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 261011B (trigger 813432415/261011727).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA =  185.63, Dec = -38.37 (J2000 degrees, equivalent to J2000 12h 23m, -38d 22')
with a statistical uncertainty of 4.2 degrees.

The angle from the Fermi LAT boresight is 83 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261011727/quicklook/glg_skymap_all_bn261011727.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/bn261011727/quicklook/glg_healpix_all_bn261011727.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261011727/quicklook/glg_lc_medres34_bn261011727.gif"