Chandra X-Ray Observatory

CDA - Contributed Datasets

Data Analysis Links
CDA Status
  • The archive is fully functional.
Reprocessing Status
  • Reprocessing has been completed for
    • Phase I: 2005-11-13 to 2011-12-31
    • Phase II: 2000-01-30 to 2005-11-13
Current Software Releases
  • ASCDSVER: 10.8.1
  • Chandra Footprint Service
    The new secure Footprint Service can be found here
  • Global Chandra Coverage
    Check out the new Chandra MOC page.
  • Browsers security warnings
    Are Chandra Data Archive pages safe? See full announcement.
  • Past Notices
Contribute the Data Behind Figures and Tables in Pubished Papers

The Dataset ID page explains the use of Dataset Identifiers in manuscripts, allowing authors to create direct links from the paper to the data of specific observations in the archive. These links may either be to single ObsIds or to larger groups of ObsIds. We encourage all users of Chandra data to include Dataset Identifiers in their manuscripts; it makes our task much easier and it ensures the accuracy of the links.

In 2007 we have added one more service to this: authors who have processed images or other pertinent and valuable datasets that are essential to their papers may submit such sets for permanent storage at the Chandra Data Archive site and refer to them in the manuscript through a custom Dataset Identifier. The first example is a dataset submitted by Ben Maughan that can be accessed at: http:// cda/ Contrib/ 2007/ MAUG1.

Specifically, we are looking for the digital data that are represented in the figures and tables of your published papers.

Requests for storing these special datasets may be submitted to . We ask that users 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  • a PDF copy of the paper (this will not be published by us, but provides us the information needed to create the necessary links)

This mechanism provides an exciting opportunity to collect valuable analysis products and we hope the community will find this repository service helpful.

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

This page maintained by the Chandra Data Archive (

Last modified: 2019-08-26

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