TITLE:   GCN CIRCULAR
NUMBER:  33991
SUBJECT: GRB 230618B: Fermi GBM Final Real-time Localization
DATE:    23/06/18 05:37:37 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 05:26:11 UT on 18 Jun 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230618B (trigger 708758776.929754 / 230618227).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 257.5, Dec = -6.7 (J2000 degrees, equivalent to J2000 17h 10m, -6d 42'), with a statistical uncertainty of 1.0 degrees.

The angle from the Fermi LAT boresight is 90.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230618227/quicklook/glg_skymap_all_bn230618227.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/bn230618227/quicklook/glg_healpix_all_bn230618227.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230618227/quicklook/glg_lc_medres34_bn230618227.gif