GCN Circular 44347
Subject
GRB 260419B: Fermi GBM Final Real-time Localization
Event
Date
2026-04-19T08:00:23Z (3 days ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:49:50 UT on 19 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260419B (trigger 798277795.43596 / 260419326).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 137.1, Dec = -33.8 (J2000 degrees, equivalent to J2000 09h 08m, -33d 47'), with a statistical uncertainty of 9.6 degrees.
The angle from the Fermi LAT boresight is 62.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419326/quicklook/glg_skymap_all_bn260419326.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/bn260419326/quicklook/glg_healpix_all_bn260419326.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419326/quicklook/glg_lc_medres34_bn260419326.gif