GCN Circular 37224

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

"At 17:17:36.47 UT on 21 August 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240821B (trigger 745953461/240821721).

The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 228.98, Dec = 77.40 (J2000 degrees, equivalent to J2000 15h 16m, 77d 24'),
with a statistical uncertainty of 3.28 degrees.

The angle from the Fermi LAT boresight is 64 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240821721/quicklook/glg_skymap_all_bn240821721.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240821721/quicklook/glg_healpix_all_bn240821721.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240821721/quicklook/glg_lc_medres34_bn240821721.gif"