Chandra X-Ray Observatory
	(CXC)

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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: 10.7.1
  • CALDBVER: 4.8.2
Announcements
  • Chandra Footprint Service
    2018-05-14
    The new secure Footprint Service can be found here
  • Global Chandra Coverage
    2018-02-14
    Check out the new Chandra MOC page.
  • Browsers security warnings
    2017-12-22
    Are Chandra Data Archive pages safe? See full announcement.
  • Past Notices
Welcome to the Chandra Data Archive

The Chandra Data Archive (CDA) plays a central role in the operation of the Chandra X-ray Center (CXC) by providing support to the astronomical community in accessing Chandra data. The CDA offers access to digital archives through powerful query engines, including VO-compliant interfaces and also serves as a permanent storage repository of contributed data products by authors who have processed images or other pertinent and valuable datasets that are essential to their publications.

Access the Chandra Data Archive

  • ChaSeR: Search & Retrieval interface for scientists, allowing specification of detailed selection criteria. Chandra Fast Image is a simplified quick search tool for Chandra X-ray images and other data for the general public.
  • FTP: Direct FTP access to the primary and secondary data products for all observations that are publicly released.
  • Cool Attitude Targets: the list of approved Cool Attitude Targets (CAT) programs, including the PI names, titles and abstracts.
    Observations Between 12/21/2018 and 04/22/2019
    Obsid Target Inst Time Proposal
    22040 2MASXJ06411806+32493 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22039 SWIFT J063107.4+1127 ACIS-I 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22038 LEDA136513 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22036 PKS0528+134 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22037 2MASXJ05325752+1345092 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22041 UGC3601 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22058 PSRB0656p14_s7 ACIS-S 20 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22056 SDSSJ085051.97+083026.6 ACIS-S 34 Calibration of the quasar Hubble diagram with z <= 0.7 quasars as CATs
    22059 2MFGC13496_s1 ACIS-S 10 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22057 UGC 10683 NED02 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22069 1RXS J174645.6+131844 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22066 SDSSJ084437.69+051538.8 ACIS-S 10 Calibration of the quasar Hubble diagram with z <= 0.7 quasars as CATs
    22067 SDSSJ084339.24+053125.2 ACIS-S 25 Calibration of the quasar Hubble diagram with z <= 0.7 quasars as CATs
    22068 HE0103-3447 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22089 UGC4211 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22090 Z31-72 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22091 SDSSJ084205.57+075925.5 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22088 SDSSJ081331.13+040949.4 ACIS-S 27 Calibration of the quasar Hubble diagram with z <= 0.7 quasars as CATs
    22117 PSRJ1023p0038_s2 ACIS-S 20 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22114 SDSSJ103712.55+015444.0 ACIS-S 19 Calibration of the quasar Hubble diagram with z <= 0.7 quasars as CATs
    22115 CGMW5-04382 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22119 1E1841m045_s2 ACIS-S 10 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22116 2XMM J185348.4-010229 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22118 Mrk417_s2 ACIS-S 10 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22132 IC0588_s3 ACIS-S 10 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22133 IC0588_s1 ACIS-S 10 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22131 PMN_J0948p0022_s3 ACIS-S 20 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22145 2HWC_J1928p178_s1 ACIS-S 19 Chandra-NuSTAR synergy in the NuSTAR serendipitous survey
    22169 RMJ135424.7-010247.8 ACIS-I 10 A random sub-sample of lambda=25-80 redMaPPer clusters
    22170 B2.2 2104+24 ACIS-S 16 X-Ray surveying radio-loud active galaxies and their large-scale environments
    22167 LEDA138501 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22168 2MASXJ02141794+5144520 ACIS-S 10 C-BASS: A Chandra Legacy Survey of AGN at the Highest Spatial Resolutions
    22193 B2.3 2254+35 ACIS-S 16 X-Ray surveying radio-loud active galaxies and their large-scale environments
  • Footprint Service: A search by position or object name overlays the footprints of Chandra Observations on Digital Sky Survey images, allowing further selection and retrieval of observations.
  • Chandra MOCs: Multi-Order Coverage maps (MOCs) for public Chandra observations, that can be used to visualize and analyze the global Chandra footprint.
  • Chandra Source Catalog: The most comprehensive catalog of sources detected in public Chandra Observations. The catalog can be accessed through CSCview.
  • CIAO Tools: There are command-line scripts for finding and downloading publicly-available Chandra data from the Archive. Please note that proprietary data can only be accessed using ChaSeR.
    • find_chandra_obsid: The tool will find publicly available Chandra data that covers a circular region of sky (a point search can be used by setting the search radius to 0).
    • download_chandra_obsid: The tool will download public data by ObsId from the Chandra archive.
  • SDSS Cross-Match Catalog: A cross-matching service linking Chandra and SDSS sources.
  • Bibliography Search: Simultaneous browsing of the archive and the literature with a large repertoire of selection criteria.
  • Processing Status: Information on the processing status of Chandra observations.
  • Special Requests: Requests for services not available through standard interfaces such as requesting a custom dataset identifier; requesting a custom database query; and many others.

This page maintained by the Chandra Data Archive (arcops@head.cfa.harvard.edu).

Last modified: 2019-01-14

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The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.