GCN Circular 34056

The Fermi GBM team reports the detection of a likely LONG GRB

"At 23:45:24.83 UT on 21 June 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 230621A (trigger 709083929/230621990).
This trigger was initially classified as Distant Particles by the flight software,
but is in fact a GRB.

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 337.40, Dec = 41.22 (J2000 degrees, equivalent to J2000 22h 29m, +41d 13'),
with a statistical uncertainty of 4.54 degrees.

The angle from the Fermi LAT boresight is 70 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230621990/quicklook/glg_skymap_all_bn230621990.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/bn230621990/quicklook/glg_healpix_all_bn230621990.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230621990/quicklook/glg_lc_medres34_bn230621990.gif"