TITLE:   GCN CIRCULAR
NUMBER:  45989
SUBJECT: GRB 261019A: Fermi GBM Final Localization
DATE:    26/10/19 14:49:02 GMT
FROM:    Christian Malacaria at INAF-OAR <cmalacaria.astro@gmail.com>

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

"At 09:14:05.59 UT on 19 October 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 261017A (trigger 814094050/261019385).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 321.9, Dec = -72.4 (J2000 degrees, equivalent to J2000 21h 27m, -72d 24'), with a statistical uncertainty of 2.6 degrees.

The angle from the Fermi LAT boresight is 118 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261019385/quicklook/glg_skymap_all_bn261019385.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/bn261019385/quicklook/glg_healpix_all_bn261019385.fit

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn261019385/quicklook/glg_lc_medres34_bn261019385.gif"