TITLE:   GCN CIRCULAR
NUMBER:  30248
SUBJECT: GRB 210618A: Fermi GBM Final Real-time Localization
DATE:    21/06/18 01:53:56 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 01:43:36 UT on 18 Jun 2021, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 210618A (trigger 645673421.140258 / 210618072).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 227.8, Dec = 42.5 (J2000 degrees, equivalent to J2000 15h 11m, 42d 30'), with a statistical uncertainty of 7.6 degrees.

The angle from the Fermi LAT boresight is 106.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210618072/quicklook/glg_skymap_all_bn210618072.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210618072/quicklook/glg_healpix_all_bn210618072.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210618072/quicklook/glg_lc_medres34_bn210618072.gif