TITLE:   GCN CIRCULAR
NUMBER:  32420
SUBJECT: GRB 220721A: Fermi GBM Final Real-time Localization
DATE:    22/07/21 00:41:52 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 00:30:25 UT on 21 Jul 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220721A (trigger 680056230.386204 / 220721021).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 356.6, Dec = -39.5 (J2000 degrees, equivalent to J2000 23h 46m, -39d 30'), with a statistical uncertainty of 9.1 degrees.

The angle from the Fermi LAT boresight is 25.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220721021/quicklook/glg_skymap_all_bn220721021.png

The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220721021/quicklook/glg_healpix_all_bn220721021.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220721021/quicklook/glg_lc_medres34_bn220721021.gif