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Access to the catalogs and astronomical archives of the HEASARC

Select an interface or start using our keyword search tool below.

HEASARC Data Access

  • Xamin Interfaces
    • Xamin Web InterfaceIntro   
    Our faster and more powerful access to HEASARC data

    Xamin API and Batch Interface
    Access the database with the Xamin application programming interface (API) that can perform all of the same tasks as the UI. You can also use it from your command line.
    Xamin VO Standard APIs
    For the full flexibility of SQL queries to bring complicated query logic directly to the database, you can use our VO APIs. See also tutorials for how to access these APIs in Python.
  • Browse Interfaces   Tips Archive
    • Browse Mission Interface  
    Our full-featured interface
    Browse Table Index
    Listing of all tables in the HEASARC database
    Browse Correlation of 2 Tables
    Correlation of more than 2 tables is available in Xamin
    Browse Notification Service
    Get notified when new data is available in the archive
    Use Xamin if you wish to monitor any query
    Browse Batch InterfaceDownload  
    Perl scripts (by default these now query Xamin database)

  • CMB Data
    • CMB Missions and Projects
    Data from space-bourne and suborbital CMB experiments in LAMBDA
  • Specialized Forms
    • Argus Proposal/Observation Info
    Search Browse proposal information for observation details and status
    Swift Data Query
    Search bursts and observations of the Swift mission

  • Direct Access to HEASARC Archive Directories
    • Command-Line Downloads
    Describes using our download script as well as wget and curl.

    If there is a published astronomical catalog that you would
    like added to the HEASARC, let us know.

    Browse Quick form divider

    Other Resources

    • SkyView - An easy-to-use tool that returns digital images of the sky in any waveband from radio through to gamma rays
    • VAO DataScope - Query catalogs and services from the HEASARC and from around the world using a single form
    • Literature - Links to literature search engines and online versions of refereed journals and science magazines

    Archive Information

    Latest News
  • Chandra Source Catalog (CSC) and related catalogs, v2.2 Released (05 Nov 2026)
    The Chandra Source Catalog (CSC) is the definitive catalog of X-ray sources detected by the Chandra X-ray Observatory. The CSC delivers a wide variety of uniformly calibrated properties and science ready data products for detected sources over four decades of flux. The Chandra Source Catalog version 2.2 (CSC 2.2) was released in October 2026. This release of the catalog includes measured properties for 432,713 unique compact and extended X-ray sources in the sky, allowing statistical analysis of large samples, as well as individual source studies in the "Master Sources" table. It is now available in Browse and Xamin. Four other related catalogs are also released: CSC Master Source-Stacked Source Associations (CSCASSOC), CSC Stacked Detections (CSCSTACK), CSC Stacked Source-Observations Source Associations (CSCSTOBAS), and CSC Stacked Source Per-observation Detections (CSCSTACKOB).
  • Swift SC CALDB updated (04 Nov 2026)
    The Swift SC has been updated to version 20261102 to update the clock correction file to v175 ...
  • NuSTAR Caldb Update (04 Nov 2026)
    The NuSTAR FPM caldb was updated to version 202611102. This release includes a new clock correction file, v235, using a new temperature model. Please see the release notes for more details.
  • NuSTAR Caldb Update (04 Nov 2026)
    The NuSTAR FPM caldb was updated to version 202611102. This release includes a new clock correction file, v235, using a new temperature model. Please see the release notes for more details.
  • Self-nominations requested for NuSTAR Users' Committee (02 Nov 2026)
    NuSTAR is seeking worldwide self-nominations for 4-year terms on its Users' Committee to provide community advice and project feedback. Letters of self-nomination, consisting of a one-page statement and a one-page CV, should be sent to nuc-chair@lists.srl.caltech.edu by December 4.
  • NuSTAR Caldb Update (21 Oct 2026)
    The NuSTAR FPM caldb was updated to version 20261020. This release includes a new clock correction file, v234, using a new temperature model. Please see the release notes for more details.

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    Last modified: Monday, 21-Apr-2025 17:48:34 EDT
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