Chandra X-Ray Observatory

CDA - Data Services

Data Analysis Links
CDA Status
  • The archive is fully functional.
Reprocessing Status
    Reprocessing IV has been completed in December 2014.
Current Software Releases
  • ASCDSVER: 10.12.4
  • CALDBVER: 4.11.1
  • Electrical Outage 11/05/21 - 11/06/21
    There will be a planned electrical outage Friday, November 5 2021, 5:30PM - Saturday, November 6 2021, 6:00PM EDT. During this time period ChaSeR and other archive interfaces will be unavailable.
  • Electrical Outage on 07/28/21
    There will be a planned electrical outage Wednesday, July 28 2021, 8:00PM - 10:00PM EDT. During this time period ChaSeR and other archive interfaces will be unavailable.
  • Downtime on 6/12/21
    Due to electrical work, the public interfaces of the Chandra Data Archive will not be available on Saturday 6/12 from 4 AM to 9 PM.
  • Repro V Begins
    The fifth major reprocessing of the archive (Repro V) has started! Details can be found here.
  • Past Notices
Services for Accessing Additional Chandra Products

The CXC has several data services for accessing Chandra data beyond the direct observational datasets:

  • Chandra Footprint Service: Provides a graphical view of Chandra Sky Coverage.
  • Chandra MOCs: Multi-Order Coverage maps (MOCs) for public Chandra observations, that can be used to visualize and analyze the global Chandra footprint.
  • Chandra Source Catalog: The Chandra Source Catalog was released on 4 March 2009
  • SDSS Cross-Match Service: A cross-matching service linking Chandra and SDSS sources.
  • Bibliography: Search the literature for Chandra-related papers, using the CDA bibliography database.

This page maintained by the Chandra Data Archive (

Last modified: 2020-04-06

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