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TITLE:   GCN CIRCULAR
NUMBER:  31808
SUBJECT: GRB 220331A: Fermi GBM Final Real-time Localization
DATE:    22/03/31 18:47:19 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 18:37:02 UT on 31 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220331A (trigger 670444627.268388 / 220331776).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 12.8, Dec = 2.9 (J2000 degrees, equivalent to J2000 00h 51m, 2d 53'), with a statistical uncertainty of 4.1 degrees.

The angle from the Fermi LAT boresight is 58.0 degrees.

The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220331776/quicklook/glg_skymap_all_bn220331776.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/bn220331776/quicklook/glg_healpix_all_bn220331776.fit

The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220331776/quicklook/glg_lc_medres34_bn220331776.gif