TITLE: GCN CIRCULAR NUMBER: 31806 SUBJECT: GRB 220330A: Fermi GBM Final Real-time Localization DATE: 22/03/30 12:38:33 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 SHORT GRB

At 12:28:09 UT on 30 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220330A (trigger 670336094.273364 / 220330520).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 324.1, Dec = 63.1 (J2000 degrees, equivalent to J2000 21h 36m, 63d 06'), with a statistical uncertainty of 3.8 degrees.

The angle from the Fermi LAT boresight is 28.0 degrees.

The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220330520/q...

The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220330520/q...

The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220330520/q...