EGR: Revised Catalog of 188 Gamma-Ray Sources from the Compton Observatory

The CGRO/EGRET Revised Catalog lists 188 point gamma-ray sources detected at energies above 100 MeV by the Compton Gamma Ray Observatory. NASA's HEASARC created this version in March 2009, which revises a prior catalog by applying new Galactic emission models and a maximum-likelihood detection method. It includes 1640 entries representing multiple observations of the sources.

Use Cases

• Cross-correlating gamma-ray source positions with known celestial objects like pulsars and blazars based on the description.
• Analyzing systematic uncertainties in source detection based on the two different cosmic-ray distribution assumptions mentioned.
• Studying the evolution of gamma-ray source catalogs by comparing the 188 EGR sources with the 271 entries in the prior 3EG catalog.
• Investigating potential extended sources or background modeling artefacts using the separate list of EGRc sources described.

Strengths

• Catalog contains 188 distinct gamma-ray sources with 1640 observational entries.
• Uses reprocessed photon data and new Galactic interstellar emission models based on CO, H I, and other data.
• Explicitly lists 14 confused sources and 30 new sources not in the previous 3EG catalog.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last updated 2026-03-13 18:56:37.492573; freshness should be verified.

Provenance

Source

National Aeronautics and Space Administration

Collection Method

Data from the EGRET detector on the Compton Gamma Ray Observatory, processed using a 2-dimensional maximum-likelihood detection method.

Time Range

null

Freshness

Last updated 2026-03-13 18:56:37.492573

Geography

null