TITLE:   GCN CIRCULAR
NUMBER:  33396
SUBJECT: GRB 230304B: Fermi GBM Final Real-time Localization
DATE:    23/03/04 14:46:09 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 14:35:49 UT on 4 Mar 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230304B (trigger 699633354.142652 / 230304608).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 111.7, Dec = 0.9 (J2000 degrees, equivalent to J2000 07h 26m, 0d 54'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 28.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230304608/quicklook/glg_skymap_all_bn230304608.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/bn230304608/quicklook/glg_healpix_all_bn230304608.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230304608/quicklook/glg_lc_medres34_bn230304608.gif