TITLE:   GCN CIRCULAR
NUMBER:  44694
SUBJECT:  GRB 260522B: Fermi GBM Final Real-time Localization
DATE:    26/05/22 12:01:10 GMT
FROM:    Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>

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

"At 09:35:00.13 UT on 22 May 2026, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 260522B (trigger 801135305/260522399).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 278.65, Dec = -33.23 (J2000 degrees, equivalent to J2000 18h 34m, -33d 12'),
with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 76 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260522399/quicklook/glg_skymap_all_bn260522399.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/bn260522399/quicklook/glg_healpix_all_bn260522399.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260522399/quicklook/glg_lc_medres34_bn260522399.gif"