TITLE:   GCN CIRCULAR
NUMBER:  33344
SUBJECT: GRB 230218A: Fermi GBM Final Real-time Localization
DATE:    23/02/18 15:56:53 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 15:46:27 UT on 18 Feb 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230218A (trigger 698427992.71955 / 230218657).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 39.6, Dec = 55.1 (J2000 degrees, equivalent to J2000 02h 38m, 55d 06'), with a statistical uncertainty of 16.0 degrees.

The angle from the Fermi LAT boresight is 10.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230218657/quicklook/glg_skymap_all_bn230218657.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/bn230218657/quicklook/glg_healpix_all_bn230218657.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230218657/quicklook/glg_lc_medres34_bn230218657.gif