TITLE:   GCN CIRCULAR
NUMBER:  31717
SUBJECT: GRB 220309A: Fermi GBM Final Real-time Localization
DATE:    22/03/09 06:15:02 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 06:04:43 UT on 9 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220309A (trigger 668498688.984364 / 220309253).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 147.0, Dec = -0.6 (J2000 degrees, equivalent to J2000 09h 48m, 0d 36'), with a statistical uncertainty of 11.5 degrees.

The angle from the Fermi LAT boresight is 59.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220309253/quicklook/glg_skymap_all_bn220309253.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/bn220309253/quicklook/glg_healpix_all_bn220309253.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220309253/quicklook/glg_lc_medres34_bn220309253.gif