TITLE:   GCN CIRCULAR
NUMBER:  44674
SUBJECT: GRB 260520A: Fermi GBM Final Localization
DATE:    26/05/20 06:47:26 GMT
FROM:    Lorenzo Scotton at UAH <lscottongcn@outlook.com>

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

"At 01:24:47.42 UT on 20 May 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260520A (trigger 800933092/260520059).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 191.01, Dec = -34.56 (J2000 degrees, equivalent to J2000 12h 44m, -34d 33’), with a statistical uncertainty of 14 degrees.

The angle from the Fermi LAT boresight is 114 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260520059/quicklook/glg_skymap_all_bn260520059.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/bn260520059/quicklook/glg_healpix_all_bn260520059.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260520059/quicklook/glg_lc_medres34_bn260520059.gif"