TITLE:   GCN CIRCULAR
NUMBER:  31831
SUBJECT: GRB 220404B: Fermi GBM Final Real-time Localization
DATE:    22/04/04 17:59:07 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 17:47:23 UT on 4 Apr 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220404B (trigger 670787248.326908 / 220404741).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 25.6, Dec = -10.8 (J2000 degrees, equivalent to J2000 01h 42m, -10d 48'), with a statistical uncertainty of 7.5 degrees.

The angle from the Fermi LAT boresight is 38.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220404741/quicklook/glg_skymap_all_bn220404741.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/bn220404741/quicklook/glg_healpix_all_bn220404741.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220404741/quicklook/glg_lc_medres34_bn220404741.gif