Fermi LAT Sources Refined Associations Catalog: Merged List of 2219 Objects

Based on 24 months of Fermi-LAT operations, this catalog provides refined associations for gamma-ray sources from the 1FGL and 2FGL releases. It was created by NASA HEASARC in May 2015, merging and reviewing associations based on multi-frequency archival observations and new spectroscopic data. The table includes 2219 unique Fermi objects and characterizes associations, introducing a new 'candidate associations' category.

Use Cases

• Cross-matching gamma-ray sources with low-energy counterparts based on the refined classification scheme.
• Analyzing the evolution of source associations by comparing 1FGL and 2FGL catalog entries.
• Identifying candidate blazars and other plausible gamma-ray emitters within positional uncertainty regions.
• Validating new spectroscopic observations against archival multi-frequency data for unidentified sources.

Strengths

• Includes 2219 unique Fermi gamma-ray objects, providing a merged reference list.
• Introduces 177 new spectra for low-energy counterparts not listed in previous catalogs.
• Based on a systematic review of associations from two major Fermi catalog releases (1FGL and 2FGL).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is from 2015; newer Fermi catalog releases may contain updated information.

Provenance

Source

National Aeronautics and Space Administration (NASA HEASARC)

Collection Method

Created based on CDS Catalog J/ApJS/217/2 file table4.dat, merging and refining associations from the 1FGL and 2FGL Fermi catalogs.

Time Range

Based on 24 months of Fermi-LAT operations (data underlying the 1FGL and 2FGL catalogs).

Freshness

Last updated 2026-03-13 17:52:55.105778; freshness should be verified against newer catalogs.

Geography

Space-based observations; celestial coverage.