GLEAM: Extragalactic Radio Source Catalog Covering 24,402 Square Degrees

307,455 radio sources detected by the Murchison Widefield Array (MWA) in its first year of observations. The catalog covers 24,402 square degrees of the southern sky and provides 20 separate flux density measurements for each source across 72-231 MHz. The National Aeronautics and Space Administration (NASA) hosts this data, which was collected in four weeks between June 2013 and July 2014.

Use Cases

• Classify radio sources based on their spectral energy distribution across 20 flux density measurements.
• Study the large-scale distribution of extragalactic objects across a 24,402 square degree sky area.
• Calibrate low-frequency flux density scales for the southern sky using the survey's stated 10% accuracy.
• Assess survey completeness and reliability for source detection algorithms at varying flux density thresholds.
• Analyze radio source properties outside the Galactic Plane and Magellanic Clouds.

Strengths

• Covers a very large sky area of 24,402 square degrees.
• Contains 307,455 sources with high reliability of 99.97% above the 5-sigma detection threshold.
• Provides 20 flux density measurements per source across a wide 72-231 MHz bandwidth.
• Estimates completeness levels (90% at 170 mJy, 50% at 55 mJy) for the catalogued region.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Spatial coverage excludes areas such as the Magellanic Clouds and regions within 10 degrees of the Galactic Plane.

Provenance

Source

Murchison Widefield Array (MWA), processed by the authors and hosted by NASA HEASARC.

Collection Method

Observations from week-long drift scan campaigns, with data from the first year (four weeks between June 2013 and July 2014).

Time Range

June 2013 to July 2014.

Freshness

Last updated 2026-03-13 18:24:36.603534; freshness should be verified.

Geography

Declinations south of +30 degrees, Galactic latitudes outside 10 degrees of the Galactic Plane, excluding the Magellanic Clouds.