PoS - Proceedings of Science
Volume 395 - 37th International Cosmic Ray Conference (ICRC2021) - GAD - Gamma Ray Direct
The new release of the fourth Fermi LAT source catalog
B. Lott*, J. Ballet, P. Bruel, T. Burnett  on behalf of the Fermi-LAT Collaboration
Full text: pdf
Pre-published on: July 10, 2021
Published on: March 18, 2022
The third release of the fourth general 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 ~ 900 more sources than the previous release (4FGL-DR2, obtained with 10 years of data) and ~ 1500 more sources than the 4FGL. About 43% 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.
DOI: https://doi.org/10.22323/1.395.0622
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