TITLE: GCN CIRCULAR NUMBER: 33306 SUBJECT: GRB 230209A: Fermi GBM Final Real-time Localization DATE: 23/02/09 04:38:55 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 04:28:40 UT on 9 Feb 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230209A (trigger 697609725.271226 / 230209187). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 227.8, Dec = -18.6 (J2000 degrees, equivalent to J2000 15h 11m, -18d 36'), with a statistical uncertainty of 1.0 degrees. The angle from the Fermi LAT boresight is 1.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209187/quicklook/glg_skymap_all_bn230209187.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/bn230209187/quicklook/glg_healpix_all_bn230209187.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209187/quicklook/glg_lc_medres34_bn230209187.gif