Chandra X-Ray Observatory

CDA - Data Analysis Links

Data Analysis Links
CDA Status
  • The archive is fully functional.
Reprocessing Status
    Reprocessing IV has been completed in December 2014.
Current Software Releases
  • ASCDSVER: 10.12.6
  • 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
Data Analysis Links
  • CIAO: For analysis of Chandra observations
  • Caldb: Download the Chandra calibration database
  • Caldb Release Notes: The release notes for the Chandra calibration database
  • AGASC1.5: Access to the Chandra Guide Star Catalog
  • Other Archives and Data Centers

    • HEASARC provides access to a large number of High Energy Astrophysics archives through W3Browse

    • NASA SSDS is NASA's Space Science Data System's depository of Astrophysics data.

    • MAST:HST is the Hubble Space Telescope archive at STScI.

    • IRSA is IPAC's Infra-Red data archive

    • LAMBDA is the Legacy Archive for Microwave Background data at GSFC/NASA.

This page maintained by the Chandra Data Archive (

Last modified: 2020-04-06

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