TITLE:   GCN CIRCULAR
NUMBER:  33397
SUBJECT: GRB 230304C: Fermi GBM Final Real-time Localization
DATE:    23/03/04 22:10:27 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 22:01:39 UT on 4 Mar 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230304C (trigger 699660104.796088 / 230304918).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 280.7, Dec = -10.8 (J2000 degrees, equivalent to J2000 18h 42m, -10d 48'), with a statistical uncertainty of 5.2 degrees.

The angle from the Fermi LAT boresight is 63.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230304918/quicklook/glg_skymap_all_bn230304918.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230304918/quicklook/glg_healpix_all_bn230304918.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230304918/quicklook/glg_lc_medres34_bn230304918.gif