NED incorporated version 2.0.1 of CSC, released by the Chandra X-Ray Center (CXC) on 2020-11-24.

The Chandra Source Catalog (CSC) is the definitive catalog of X-ray sources detected by the Chandra X-ray Observatory. Version 2.0 (CSC2) is the second major release of the catalog, and represents a significant improvement with respect to version 1.1 in terms of sky coverage, sensitivity and capabilities. CSC2 includes measured properties for 317,167 unique compact and extended X-ray sources in the sky, allowing statistical analysis of large samples, as well as individual source studies.

This catalog is based on Chandra ACIS and HRC-I imaging observations released publicly through the end of 2014.

Additional References:
2010ApJS..189...37E
2019HEAD...1711401E
2020AAS...23515405E

https://cxc.cfa.harvard.edu/csc/

Acknowledgement: This research has made use of data obtained from the Chandra Source Catalog, provided by the Chandra X-ray Center (CXC) as part of the Chandra Data Archive.

Origin: Catalog data file 2.0.1 was obtained from Chandra X-Ray Center (CXC) on 2021-05-03.