Jul 12 – 23, 2021
Europe/Berlin timezone

The new release of the fourth Fermi LAT source catalog

Jul 12, 2021, 6:00 PM
1h 30m


Talk GAD | Gamma Ray Direct Discussion


Benoit Lott (CENBG)


The third release of the Fourth Catalog of Fermi-LAT Sources (4FGL-DR3), based on 12 years of data between 50 MeV and 1 TeV, is presented. Improvements in the analysis method relative to the original 4FGL catalog and new features are reviewed. The 4FGL-DR3 includes about 750 more sources than the previous release (4FGL-DR2, obtained with 10 years of data) and about 1500 more sources than 4FGL. About 40% of the new sources are associated with counterparts at other wavelengths, which are mostly blazar candidates. The properties of the global set of unassociated sources reported in the catalog are discussed, with particular attention to those lying close to the Galactic plane. A population of unassociated sources that do not fit in with already known classes of gamma-ray emitters is emphasized.


Catalog; gamma-ray sources:

Collaboration Ferrmi-LAT
Subcategory Experimental Results

Primary author


Presentation materials