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TITLE:   GCN CIRCULAR
NUMBER:  32509
SUBJECT: GRB 220831B: Fermi GBM Final Localization
DATE:    22/09/01 16:45:13 GMT
FROM:    Joshua Wood at MSFC/Fermi-GBM  <joshua.r.wood@nasa.gov>

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

At 13:11:36.16 UT on 31 Aug 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220831B (trigger 683644301 / 220831550).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 167.3, Dec = +1.0 (J2000 degrees, equivalent to J2000 11h 09m, +01d 00'), with a statistical uncertainty of 4.7 degrees.

The angle from the Fermi LAT boresight is 63.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220831550/quicklook/glg_skymap_all_bn220831550.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/bn220831550/quicklook/glg_healpix_all_bn220831550.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220831550/quicklook/glg_lc_medres34_bn220831550.gif