Chandra X-Ray Observatory

CDA - Contributed Datasets

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
Contribute the Data Behind Figures and Tables in Pubished Papers

Authors who have processed Chandra images or other pertinent and valuable datasets that are essential to their scientific publications are welcome to submit such datasets for storage at the Chandra Data Archive site, although those authors seeking permanent storage are encouraged to consider alternative data hosting services like those provided by CDS, Zenodo, Figshare, etc. We are particularly interested in the digital data that are represented in the figures and tables of published papers. An example of such dataset can be accessed here. Requests for storing these special datasets may be submitted to

We ask that users kindly provide:

  • an explanation of the data and context
  • a tarfile containing a self-contained web tree:
    • an index.html file that provides an explanation of the dataset and all access to the dataset's files
    • a subdirectory with the actual data files; all access to the dataset's files need to go through the index file; see the example mentioned above
  • a PDF copy of the paper (this will not be published by us, but provides us the information needed to create the necessary links)

List of contributed datasets:

The pre-packaged datasets of the Chandra Deep Fields are also available in this category:

The HETG Orion Legacy Project:

This page maintained by the Chandra Data Archive (

Last modified: 2020-04-06

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