GCN Circular 45409
Subject
GRB260820A: Fermi GBM Final Real-Time Localization
Event
Date
2026-08-20T07:41:32Z (2 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 SHORT GRB.
"At 04:24:39.99 UT on 20 August 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260820A (trigger 808892684/260820184).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 118.3, Dec = -6.1 (J2000 degrees, equivalent to J2000 7h 53m, -6d 5'), with a statistical uncertainty of 11.5 degrees.
The angle from the Fermi LAT boresight is 56 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260820184/quicklook/glg_skymap_all_bn260820184.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/bn260820184/quicklook/glg_healpix_all_bn260820184.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260820184/quicklook/glg_lc_medres34_bn260820184.gif"