TITLE:   GCN CIRCULAR
NUMBER:  33822
SUBJECT: GRB 230518A: Fermi GBM Final Real-time Localization
DATE:    23/05/18 22:59:56 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 SHORT GRB

At 22:49:27 UT on 18 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230518A (trigger 706142972.60896 / 230518951).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 256.4, Dec = -49.6 (J2000 degrees, equivalent to J2000 17h 05m, -49d 36'), with a statistical uncertainty of 19.0 degrees.

The angle from the Fermi LAT boresight is 23.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230518951/quicklook/glg_skymap_all_bn230518951.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/bn230518951/quicklook/glg_healpix_all_bn230518951.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230518951/quicklook/glg_lc_medres34_bn230518951.gif