TITLE:   GCN CIRCULAR
NUMBER:  31951
SUBJECT: GRB 220426B: Fermi GBM Final Real-time Localization
DATE:    22/04/26 07:20:50 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 07:10:36 UT on 26 Apr 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220426B (trigger 672649841.18156 / 220426299).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 138.4, Dec = -13.8 (J2000 degrees, equivalent to J2000 09h 13m, -13d 48'), with a statistical uncertainty of 5.2 degrees.

The angle from the Fermi LAT boresight is 55.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220426299/quicklook/glg_skymap_all_bn220426299.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220426299/quicklook/glg_healpix_all_bn220426299.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220426299/quicklook/glg_lc_medres34_bn220426299.gif