Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 31380

GRB 220104A: Fermi GBM Final Real-time Localization
2022-01-04T04:11:29Z (2 years ago)
Fermi GBM Team at MSFC/Fermi-GBM <>
The Fermi GBM team reports the detection of a likely SHORT GRB

At 04:01:02 UT on 4 Jan 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220104A (trigger 662961667.603716 / 220104167).

The on-ground calculated location, using the Fermi GBM trigger data, is RA = 197.8, Dec = 42.1 (J2000 degrees, equivalent to J2000 13h 11m, 42d 06'), with a statistical uncertainty of 3.1 degrees.

The angle from the Fermi LAT boresight is 17.0 degrees.

The skymap can be found here:

The HEALPix FITS file, including the estimated localization systematic, can be found here:

The GBM light curve can be found here:
Looking for U.S. government information and services? Visit