GCN Circular 44694
Subject
GRB 260522B: Fermi GBM Final Real-time Localization
Event
Date
2026-05-22T12:01:10Z (7 days ago)
From
Cuán de Barra at UCD <cuan.debarra@ucdconnect.ie>
Via
Web form
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"