Chandra X-Ray Observatory

CDA - Chaser Help

Data Analysis Links
CDA Status
  • The archive is fully functional.
Reprocessing Status
    Reprocessing IV has been completed in December 2014.
Current Software Releases
  • ASCDSVER: 10.8.4
  • CALDBVER: 4.9.2
What's New
  • 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
ChaSer: Search and Retrieval from the Chandra Data Archive

Chaser has been retired

The Java application Chaser was retired on 1 April 2013. All functionality and more now found in the web-based ChaSeR.

All Functionality and more now found in ChaSeR

ChaSeR has all of its former functionality with many new features, including:
  • Functions previously found only in (Java) Chaser:
    • lists of positions
    • search ranges
    • access to supporting products
  • Access to ERs

This page maintained by the Chandra Data Archive (

Last modified: 2020-04-06

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