CGRO/EGRET: Gamma-Ray Photon Lists and Maps from 1991-2000

NASA's Energetic Gamma-Ray Experiment Telescope (EGRET) data catalog contains photon lists and processed maps from observations between April 1991 and May 2000. The final archive includes photon lists for each viewing period, along with generated counts, exposure, and intensity maps for standard energy ranges from about 30 MeV to over 20 GeV. This dataset was supplied by the CGRO Science Support Center and last updated in May 2001, with galactic coordinates added by the HEASARC in August 2005.

Use Cases

• Analyzing gamma-ray source distributions based on photon counts maps.
• Studying high-energy photon flux and exposure across different energy ranges mentioned in the description.
• Modeling instrument response and point-spread function using data within 30 degrees of the instrument axis.
• Investigating temporal variability of gamma-ray sources across the mission's viewing periods.

Strengths

• Data covers a significant time range from April 1991 to May 2000.
• Includes final, post-mission processed versions of all data files.
• Maps are generated for a standard set of energy ranges from about 30 MeV to over 20 GeV.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration (NASA), CGRO Science Support Center, HEASARC.

Collection Method

Observations from the Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory.

Time Range

April 1991 to May 2000.

Freshness

Last updated 2026-03-13 20:11:49.522272; freshness should be verified.

Geography

Celestial observations; galactic coordinates were added to the table.