articleThe Astrophysical Journal Supplement SeriesJun 1, 2022GOLD OA

Incremental Fermi Large Area Telescope Fourth Source Catalog

Centre National de la Recherche Scientifique · Université Toulouse III - Paul Sabatier · +87 more institutions

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Abstract

Abstract We present an incremental version (4FGL-DR3, for Data Release 3) of the fourth Fermi Large Area Telescope (LAT) catalog of γ -ray sources. Based on the first 12 years of science data in the energy range from 50 MeV to 1 TeV, it contains 6658 sources. The analysis improves on that used for the 4FGL catalog over eight years of data: more sources are fit with curved spectra, we introduce a more robust spectral parameterization for pulsars, and we extend the spectral points to 1 TeV. The spectral parameters, spectral energy distributions, and associations are updated for all sources. Light curves are rebuilt for all sources with 1 yr intervals (not 2 month intervals). Among the 5064 original 4FGL sources,…

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