2SXPS: Swift X-ray Point Source Catalog with 206,335 Unique Sources
Updated 3mo ago
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Description
206,335 unique X-ray sources detected by the Swift X-ray Telescope between 2005-01-01 and 2018-08-01. The catalog, produced by NASA, contains 1,091,058 detections across 3,790 square degrees of sky, with each source described by 230 parameters including rates in four energy bands and hardness ratios. It represents an enhancement over the previous 1SXPS catalog with improved models, more data, and nearly double the sky coverage.
Use Cases
Identify and catalog uncatalogued X-ray sources based on the reported 78,100 such objects.
Analyze source variability over time using the 82,324 flagged variable sources.
Calculate and study spectral properties and hardness ratios across the defined energy bands.
Perform cross-matching and population studies using the reported position errors and source characteristics.
Strengths
Contains 206,335 unique sources derived from 1,091,058 detections, providing a large sample for analysis.
Covers 3,790 square degrees of the sky with a typical sensitivity as low as 4x10^-14 erg cm^-2 s^-1 in stacked images.
Includes 230 parameters per source, detailing rates in four energy bands, hardness ratios, and spectral parameters.
Uses an improved detection pipeline with better PSF and pile-up models, and filters for data quality.
Limitations
Column-level documentation is absent; field semantics for the 230 parameters must be inferred after download.
Row count is unknown, which may limit suitability assessment for specific computational tasks.
Data freshness should be verified as the catalog covers observations up to 2018.
Provenance
Source
National Aeronautics and Space Administration
Collection Method
Observations from the Swift X-ray Telescope (XRT) in Photon Counting mode, processed with a source detection algorithm on individual and stacked images.
Time Range
2005-01-01 to 2018-08-01
Freshness
Last updated 2026-03-13 16:54:57.585058; temporal coverage ends 2018-08-01.
Geography
Sky coverage of 3,790 square degrees.
License is listed as 'other-license-specified'; specific terms must be checked. File formats are BIN and HTML, which may require specialized tools for access.