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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html lang="en">  <head>  <title>CDA - Home</title> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" > <meta http-equiv="keywords" content="chandra, x-ray, astronomy, astrophysics, axaf,data archive"> <meta http-equiv="description" content="CDA - Home"> <link rel="stylesheet" href="/incl/cxcstyle_template.css" type="text/css" media="screen"> <link rel="stylesheet" href="/incl/cxcstyle.css" type="text/css" media="screen"> <link rel="stylesheet" href="/cda/css/cdastyle.css" type="text/css" media="screen"> <link rel="stylesheet" href="/incl/cxcprint.css" type="text/css" media="print"> <link href='../cxc-logo-72.png' rel='icon'> </head> <body>       <script src="/scripts/webtrends.js" type="text/javascript"></script>     <script type="text/javascript"> //<![CDATA[ var _tag=new WebTrends(); _tag.dcsGetId(); //]]> </script> <script type="text/javascript"> //<![CDATA[ _tag.dcsCustom=function(){ // Add custom parameters here. //_tag.DCSext.param_name=param_value; } _tag.dcsCollect(); //]]> </script> <noscript> <div><img alt="DCSIMG" id="DCSIMG" width="1" height="1" src="//logs1.smithsonian.museum/dcscdsyh8bdzpxna72mrneyep_4s6j/njs.gif?dcsuri=/nojavascript&WT.js=No&WT.tv=9.4.0&dcssip=www.cxc.cfa.harvard.edu"/></div> </noscript>  <div id="cxcheader"> <div id="cxcheaderleft"> <a href="/index.html"> <img style="min-width: 100%" id="spacecraft" src="/incl/withoutrays.png" alt="Chandra X-Ray Observatory (CXC)"></a> </div> <div id="cxcheaderright"> <ul> <li><a href="/ciao/">Data Analysis</a></li> <li><a href="/cda/">Archive</a></li> <li><a href="/proposer/">Proposer</a></li> <li><a href="/index.html">CXC Home</a></li> </ul> <ul> <li><a href="https://chandra.harvard.edu/">For the Public</a></li> <li><a href="/cal/">Instruments & Calibration</a></li> </ul> </div> </div> <div id="content"> <h1 class="printOnly">CDA - Home</h1> <div class="leftblock"> <div class="box"> <div class="center"><a href="/cda"><img src="/cda/incl/cdalogo.gif"></a></div>  <ul id="sitenav" class="links"> <li><a href="https://cda.harvard.edu/chaser">ChaSeR</a></li> <li><a href="../../csc">Chandra Source Catalog</a> ♦ <a href = "https://cda.harvard.edu/cscview">CSCview</a></li> <li><a href="https://cxcfps.cfa.harvard.edu/cda/footprint/cdaview.html">Chandra Footprint Service</a> <li><a href="/cda/acknowledgment.html">Request for Acknowledgement</a></li> <li><img src="/cda/incl/Twitter_Social_Icon_Circle_Color.png" width="25" height="25"> <a href="https://twitter.com/chandraarchive">@ChandraArchive</a></li> </ul> <div class="shaded"> <div class="mC shaded">  <h5 id="menu1"><img src="/incl/right.png" alt="+" class="arrow" id="arrow1"/> The Archive</h5> <ul> <li><a href="/cda/public.html">Public Data</a></li> <li><a href="/cda/proprietary.html">Proprietary Data</a></li> <li><a href="/cda/repro3.html">Repro III</a></li> <li><a href="/cda/repro4.html">Repro IV</a></li> <li><a href="/cda/repro5.html">Repro V</a></li> <li><a href="/cda/pia.html">Privacy Impact Assessment</a></li> <li><a href="/cda/releases.html">Release Notes</a></li> <li><a href="/cda/docs.html">Documentation</a></li> <li><a href="/cda/arcops.html">Archive Operations Team</a></li> </ul> <h5 id="menu2"><img src="/incl/right.png" alt="+" class="arrow" id="arrow2"/> Search and Retrieve Data</h5> <ul> <li><a href="/cda/tools.html">Synopsis of Tools</a></li> <li><a href="https://cda.harvard.edu/chaser">ChaSeR</a></li> <li><a href="https://cxc.cfa.harvard.edu/cdaftp/">HTTPS Direct Access</a></li> <li><a href="https://cda.harvard.edu/pop">Chandra Fast Image</a></li> <li><a href="/cda/CCT.html">Chandra Cool Targets</a></li> </ul> <h5 id="menu3"><img src="/incl/right.png" alt="+" class="arrow" id="arrow3"/> Advanced Data Services</h5> <ul> <li><a href="/cda/dataservices.html">Synopsis of Services</a></li> <li><a href="https://cxcfps.cfa.harvard.edu/cda/footprint/cdaview.html">Footprint Service</a></li> <li><a href="/cda/cda_moc.html">Chandra MOCs</a></li> <li><a href="../../csc">Chandra Source Catalog</a></li>  <li><a href="../../cgi-gen/cda/bibliography">Bibliography Search</a></li> </ul> <h5 id="menu4"><img src="/incl/right.png" alt="+" class="arrow" id="arrow4"/> Archive User Services</h5> <ul> <li><a href="/cda/archiveservices.html">Synopsis of Services</a></li> <li><a href="../../soft/op/op_pst.html">Processing Status</a></li> <li><a href="../../cgi-gen/cda/specreq">Special Requests</a></li> <li><a href="/cda/cda_doi.html">Dataset Identifiers (DOIs)</a></li> <li><a href="/cda/contributedsets.html">Contributed Datasets</a></li> <li><a href="/cda/cxo_papers/cxo_papers.html">CXO Papers Repository</a></li> </ul> <h5 id="menu5"><img src="/incl/right.png" alt="+" class="arrow" id="arrow5"/> Chandra Aggregated Datasets</h5> <ul> <li><a href="/cda/Contrib/CDFN.html">Chandra Deep Field North</a></li> <li><a href="/cda/Contrib/CDFS.html">Chandra Deep Field South</a></li> </ul> <h5 id="menu6"><img src="/incl/right.png" alt="+" class="arrow" id="arrow6"/> Publishing Chandra Results</h5> <ul> <li><a href="/cda/acknowledgment.html">Request for Acknowledgment</a></li> <li><a href="../../cdo/scipubs.html">Naming Conventions</a></li> <li><a href="/cda/cda_doi.html">Dataset Identifiers</a></li> </ul> <h5 class="noarrow"><a href="/cda/toollinks.html">Data Analysis Links</a></h5>  <noscript> <br> <h5>If JavaScript is off, the menu above will not work. Here is an expanded list of navigation links to use instead.</h5><br> <h5> The Archive</h5> <li><a href="/cda/public.html">Public Data</a></li> <li><a href="/cda/proprietary.html">Proprietary Data</a></li> <li><a href="/cda/repro3.html">Repro III</a></li> <li><a href="/cda/repro4.html">Repro IV</a></li> <li><a href="/cda/pia.html">Privacy Impact Assessment</a></li> <li><a href="/cda/releases.html">Release Notes</a></li> <li><a href="/cda/docs.html">Documentation</a></li> <li><a href="/cda/arcops.html">Archive Operations Team</a></li> </ul> <h5> Search and Retrieve Data</h5> <li><a href="/cda/tools.html">Synopsis of Tools</a></li> <li><a href="https://cda.harvard.edu/chaser">ChaSeR</a></li> <li><a href="https://cxc.cfa.harvard.edu/cdaftp/">HTTPS Direct Access</a></li> <li><a href="https://cda.harvard.edu/pop">Chandra Fast Image</a></li> <li><a href="../../targets">Target Pages</a></li> </ul> <h5> Advanced Data Services</h5> <li><a href="/cda/dataservices.html">Synopsis of Services</a></li> <li><a href="https://cxcfps.cfa.harvard.edu/cda/footprint/cdaview.html">Footprint Service</a></li> <li><a href="../../csc">Chandra Source Catalog</a></li> <li><a href="../../cgi-gen/cda/CSC-SDSSxmatch.html">SDSS Cross-Match Catalog</a></li> <li><a href="../../cgi-gen/cda/bibliography">Bibliography Search</a></li> </ul> <h5> Archive User Services</h5> <li><a href="/cda/archiveservices.html">Synopsis of Services</a></li> <li><a href="../../soft/op/op_pst.html">Processing Status</a></li> <li><a href="../../cgi-gen/cda/specreq">Special Requests</a></li> <li><a href="/cda/datasetid.html">Dataset Identifiers</a></li> <li><a href="/cda/contributedsets.html">Contributed Datasets</a></li> <li><a href="/cda/bib.html">SPIE Repository</a></li> </ul> <h5> Chandra Aggregated Datasets</h5> <li><a href="/cda/Contrib/CDFN.html">Chandra Deep Field North</a></li> <li><a href="/cda/Contrib/CDFS.html">Chandra Deep Field South</a></li> </ul> <h5> Publishing Chandra Results</h5> <li><a href="/cda/acknowledgment.html">Request for Acknowledgment</a></li> <li><a href="../../cdo/scipubs.html">Naming Conventions</a></li> <li><a href="/cda/datasetid.html">Dataset Identifiers</a></li> </ul> <h5><a href="/cda/toollinks.html">Data Analysis Links</a></h5> </noscript> </div> </div> </div> </div> <div class="rightblock"> <div class="box"> <div class="aheader">CDA Status</div> <ul id="status"> <li>The archive is fully functional. </li>   </ul> <div class="aheader">Reprocessing Status</div> <ul id="reprostatus"> Reprocessing IV has been completed in December 2014.  </ul> <div class="aheader">Current Software Releases</div> <ul id="releasestatus"> <li><span class="term">ASCDSVER</span>: 10.13</li> <li><span class="term">CALDBVER</span>: 4.12.0</li> </ul> <div class="aheader">Announcements</div> <div> <ul id="news"> <li>Electrical Outage 11/05/21 - 11/06/21 <br /> <span class="date">2021-11-05</span> <br /> 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. </li> <li>Electrical Outage on 07/28/21 <br /> <span class="date">2021-07-26</span> <br /> 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. </li> <li>Downtime on 6/12/21 <br /> <span class="date">2021-06-10</span> <br /> 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. </li> <li>Repro V Begins <br /> <span class="date">2020-10-26</span> <br /> The fifth major reprocessing of the archive (Repro V) has started! Details can be found <a href="https://cxc.cfa.harvard.edu/cda/repro5.html">here</a>. </li> <li><a href="/cda/Announcements/index.html">Past Notices</a></li> </ul> </div> </div> </div> <div class="centerblock"> <div id="breadcrumbs"> <a href="/">CXC</a> → <a href="/cda/cda-new">CDA</a> </div> <div id="upcoming">Welcome to the Chandra Data Archive</div>  <div class="top-bottom-space"> <p> 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.</p> <h2>Access the Chandra Data Archive</h2> <ul> <li><a href="https://cda.harvard.edu/chaser">ChaSeR</a>: Search & Retrieval interface for scientists, allowing specification of detailed selection criteria.</li> <li><a href="https://cda.harvard.edu/pop">Chandra Fast Image</a> is a simplified quick search tool for <em>Chandra</em> X-ray images and other data for the general public.</li> <li><a href="https://cxc.cfa.harvard.edu/cdaftp/">HTTPS</a>: Direct access to the primary and secondary data products for all observations that are publicly released.</li> <li><a href="CCT.html">Cool Chandra Targets</a> (formerly known as CATs): the list of approved Cool Chandra Targets (CCTs) programs, including the PI names, titles and abstracts. </li> <li><a href="https://cxcfps.cfa.harvard.edu/cda/footprint/cdaview.html">Footprint Service</a>: A search by position or object name overlays the footprints of <em>Chandra</em> Observations on Digital Sky Survey images, allowing further selection and retrieval of observations.</li> <li><a href="/cda/cda_moc.html">Chandra MOCs</a>: Multi-Order Coverage maps (MOCs) for public Chandra observations, that can be used to visualize and analyze the global Chandra footprint.</li> <li><a href="../../csc">Chandra Source Catalog</a>: The most comprehensive catalog of sources detected in public Chandra Observations. The catalog can be accessed through <a href = "https://cda.cfa.harvard.edu/cscview">CSCview</a>.</li> <li><a href="../../ciao/threads/archivedownload/">CIAO Tools</a>: 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 <a href="https://cda.harvard.edu/chaser">ChaSeR</a>. <ul> <li><a href = "../../ciao/ahelp/find_chandra_obsid.html">find_chandra_obsid</a>: 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).</li> <li><a href = "../../ciao/ahelp/download_chandra_obsid.html">download_chandra_obsid</a>: The tool will download public data by ObsId from the Chandra archive.</li> </ul> </li>  <li><a href="../../cgi-gen/cda/bibliography">Bibliography Search</a>: Simultaneous browsing of the archive and the literature with a large repertoire of selection criteria.</li> <li><a href="../../soft/op/op_pst.html">Processing Status</a>: Information on the processing status of <em>Chandra</em> observations.</li> <li><a href="../../cgi-gen/cda/specreq">Special Requests</a>: Requests for services not available through standard interfaces such as requesting a custom dataset identifier; requesting a custom database query; and many others.</li> <li><a href="/cda/ztf_annotations/ztf_front.html">ZTF Annotation</a>: Annotation of the <em>Chandra</em> archival observations with Zwicky Transient Factory objects</li> <li><a href="dois.html">CDA Data Object Identifiers (DOIs)</a>: The new way to cite <em>Chandra</em> data in publications!</li> </ul> </p> </div> </div> </div>  <div id="arcopsfooter"> <div id="arcopsfooterleft"> <p>This page maintained by the <em>Chandra Data Archive</em> (<a href="mailto:arcops@cfa.harvard.edu">arcops@cfa.harvard.edu</a>).</p> </div> <div id="arcopsfooterright"> <p>Last modified: 2024-02-05 </p> </div> </div> <div id="cxcfooter"> <div id="cxcfooterleft">  <a href="/index.html"><img src="/incl/cxcfooterCXCicon.png" alt = "Smithsonian Institute"></a> <a href="http://www.si.edu"><img src="/incl/smithsonian.png" alt = "Smithsonian Institute"></a> </div> <div id="cxcfooterright"> <ul> <li><a href="/index.html">CXC Home</a></li>  <li><a href="/cdo/observatory_links.html#NASA">NASA Archives and Centers</a></li> <li><a href="/cdo/observatory_links.html">Astronomy Links</a></li> <li><a href="http://icxc.harvard.edu/">iCXC (CXC only)</a></li> <li><a href="http://cxc.harvard.edu/help/">Helpdesk</a></li> </ul> <p><em>The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory.</em> 60 Garden Street, Cambridge, MA 02138 USA.   Email:   <a style="color:white;" href="mailto:cxchelp@head.cfa.harvard.edu">cxchelp@head.cfa.harvard.edu</a> Smithsonian Institution, Copyright © 1998-2025. 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