Fermi Gamma-ray Space Telescope

The Fermi-LAT Fourth Source Catalog

Benoit Lott
(Benoit Lott, Jean Ballet, Toby Burnett, Seth Digel for the Fermi-LAT collaboration)


The Fermi-LAT Fourth Source Catalog (4FGL), based on 8 years of E>50 MeV photon data, will comprise about 5500 sources. This number corresponds to a 60% increase relative to 3FGL. The talk will describe the analysis improvements over 3FGL and the new catalog features. About 66% of the sources will have high-confidence counterparts detected at other wavelengths. The nature and properties of the newly detected sources will be discussed.