TITLE:   GCN CIRCULAR
NUMBER:  44346
SUBJECT: GRB 260419A: Fermi GBM Final Real-time Localization
DATE:    26/04/19 07:20:17 GMT
FROM:    Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>

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

At 07:09:40 UT on 19 Apr 2026, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 260419A (trigger 798275385.308626 / 260419298).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 317.4, Dec = -34.4 (J2000 degrees, equivalent to J2000 21h 09m, -34d 23'), with a statistical uncertainty of 2.3 degrees.

The angle from the Fermi LAT boresight is 77.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419298/quicklook/glg_skymap_all_bn260419298.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/bn260419298/quicklook/glg_healpix_all_bn260419298.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260419298/quicklook/glg_lc_medres34_bn260419298.gif