TITLE:   GCN CIRCULAR
NUMBER:  31672
SUBJECT: GRB 220304A: Fermi GBM Final Real-time Localization
DATE:    22/03/04 05:39:15 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 05:28:58 UT on 4 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220304A (trigger 668064543.786552 / 220304228).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 245.0, Dec = -35.7 (J2000 degrees, equivalent to J2000 16h 19m, -35d 42'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 145.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220304228/quicklook/glg_skymap_all_bn220304228.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/bn220304228/quicklook/glg_healpix_all_bn220304228.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220304228/quicklook/glg_lc_medres34_bn220304228.gif