Chandra X-ray Center

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <meta name="description" content="SAO High Energy Astrophysics Division"/> <meta name="author" content=""> <title>Chandra X-ray Center</title>  <link href="incl/bootstrap-css/bootstrap.min.css" rel="stylesheet">  <link href="incl/cxc_cycle20.css?v=1" rel="stylesheet"> <link href="https://fonts.googleapis.com/css?family=PT+Sans+Narrow|Sarpanch:400,700" rel="stylesheet">     <meta name="keywords" content="SI, Smithsonian, Smithsonian Institute" /> <meta name="keywords" content="CfA, SAO, Harvard-Smithsonian, Center for Astrophysics" /> <meta name="keywords" content="HEA, HEAD, High Energy Astrophysics Division" /> <meta name="title" content="Chandra X-Ray Center"/> <meta name="creator" content="SAO-HEA"/> <meta http-equiv="content-language" content="en-US"/> <meta name="subject" content="SAO High Energy Astrophysics Division"/> <meta http-equiv="X-Frame-Options" content="Deny"/> </head> <body>  <nav class="navbar navbar-inverse navbar-fixed-top" role="navigation" style="background-image: linear-gradient(rgba(0,0,0,0.35),rgba(0,0,0,0.35)), url('https://chandra.harvard.edu/photo/2009/galactic/galactic.jpg');background-position:center; background-size: cover;"> <div class="container">  <div class="navbar-header"> <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <div id="title"> <a href="index.html"><img src="./incl/chandra_header.png"></a> </div> </div> <div id="arrow"> <a href="#arrow"><img src="./incl/arrow-down.png"></a> </div>  <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1"> <ul class="nav navbar-nav navbar-right"> <li class="header-link"> <span><a href="/proposer/">Proposer</a></span> </li> <li class="header-link"> <span><a href="/cda/">Archive</a></span> </li> <li class="header-link"> <span><a href="/ciao/">Data<br/>Analysis</a></span> </li> <li class="header-link long_title"> <span><a href="/cal/">Instruments<br class="rwd-break"> and<br/>Calibration</a></span> </li> <li class="header-link"> <span><a href="http://chandra.harvard.edu/">For The<br/>Public</a></span> </li> </ul> <div class="second_row"> <ul class="navbar-second nav navbar-nav navbar-right"> <li class="header-link"> <span><a href="http://cda.harvard.edu/chaser">Get Chandra<br/>Data</a></span> </li> <li class="header-link"> <span><a href="http://cxc.cfa.harvard.edu/csc/">Chandra<br class="rwd-break"> Source<br/>Catalog</a></span> </li> <li class="header-link"> <span><a href="http://cxc.harvard.edu/help/">HelpDesk</a></span> </li> <li class="header-link"> <span><a href="/cdo/cxcstaff/cxcstaff.php">CXC<br/>Staff</a></span> </li> <li class="header-link"> <span><a href="/cdo/cxc_opportunities.html">CXC<br/>Opportunities</a></span> </li> <li class="header-link"> <span><a href="/cdo/code.html">CXC Code<br> of Conduct</a></span> </li> <li class="header-link long_title"> <span> <a href="http://cxc.harvard.edu/announcements/">Announcements</a> </span> </li> <li class="header-link"> <span> <a href="#portal">Portal</a> </span> </li> <li class="header-link"> <span> <a href="/cdo/about_chandra/">About<br/>Chandra</a> </span> </li> </ul> </div> </div>  </div>  </nav> <div id="announcements" class="container">    <div id="celebrate"> <a href="/cdo/chandra25/"><div class="celebratetxt">Celebrating 25 Years of Chandra</div></a> </div> <div id="news"> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4>CUC Releases Report</h4> </div> <div class="panel-body"> The Chandra Users’ Committee (CUC) held its Fall meeting Oct 8-9, 2024, and has released a report summarizing the presentations and outlining its recommendations. <br/> <br/> Current and previous CUC reports, along with the current list of CUC members, are always available at: <a href="https://cxc.harvard.edu/cdo/cuc">https://cxc.harvard.edu/cdo/cuc</a>. <p class="date">1/8/25</p> </div> </div> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4>Chandra Cycle 27 Call For Proposals</h4> </div> <div class="panel-body"> The CXC is pleased to announce the release of the Chandra Cycle 27 Call for Proposals (CfP). The Call for Proposals, Proposers' Observatory Guide (POG), proposal planning software, and general information are posted on the <a href="/proposer/">"Proposer" web page</a>. <br><br> See the <a href="https://groups.google.com/a/cfa.harvard.edu/g/chandra-announce/c/C1zfTRA9bcg/m/yE91RWJ1BgAJ">full announcement</a> for more detail. <p class="date">12/19/24</p> </div> </div> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4>Chandra Source Catalog Release 2.1 — The 22-year Source Catalog</h4> </div> <div class="panel-body"> Release 2.1 of the Chandra Source Catalog (CSC 2.1) is now available. The catalog covers roughly 730 square degrees of sky and contains 407,806 unique X-ray sources. <br><br> See the <a href="https://groups.google.com/a/cfa.harvard.edu/g/chandra-announce/c/i-WOMwi9pc4/m/QzxfMy9oAAAJ">full announcement</a> for more detail. <p class="date">4/2/24</p> </div> </div> </div> </div> </div> <div class="container"> <div id="events" class="row"> <div class="news">  <div class="col-md-4">  <a href="/proposer/CfP">  <img class="img-responsive img-portfolio img-hover" src="./incl/CfP_cycle27_card.png" alt="Cycle 27 Call for Proposals">  <div class="image_text"> <span class="image_text_header"></span> </div> </a> </div>  <div class="col-md-4">  <a href="https://groups.google.com/a/cfa.harvard.edu/g/chandra-announce/c/xPKAj6kutOw">  <img class="img-responsive img-portfolio img-hover" src="./incl/DPR_TownHall_card.png" alt="Town Hall Meeting on Chandra’s Distributed Peer Review for Cycle 27">  </a> </div>  <div class="col-md-4">  <a href="/target_lists/cycle26/ChandraCycle26_Brochure.pdf">  <img class="img-responsive img-portfolio img-hover" src="./incl/Cycle26card.png" alt="Chandra Science Program">  </a> </div> </div> </div> </div> <div id="highlights" class="container"></div> <div id="myCarousel" class="carousel slide"> <ol class="carousel-indicators"> <li data-target="#myCarousel" data-slide-to="0" class="active"></li> <li data-target="#myCarousel" data-slide-to="1"></li> <li data-target="#myCarousel" data-slide-to="2"></li> <li data-target="#myCarousel" data-slide-to="3"></li> <li data-target="#myCarousel" data-slide-to="4"></li> <li data-target="#myCarousel" data-slide-to="5"></li> <li data-target="#myCarousel" data-slide-to="6"></li> <li data-target="#myCarousel" data-slide-to="7"></li> <li data-target="#myCarousel" data-slide-to="8"></li> <li data-target="#myCarousel" data-slide-to="9"></li> </ol> <div class="carousel-inner"> <div class="item active"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2025/helix/helix.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2025/helix/"><h2>X-ray Signal Points to Destroyed Planet, Chandra Finds</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2025/30dor/30dor.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2025/30dor/"><h2>NASA Telescopes Deliver Stellar Bouquet in Time for Valentine's Day</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2025/filaments/filaments.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2025/filaments/"><h2>Black Holes Can Cook for Themselves, Chandra Study Shows</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2025/wolf359/wolf359.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2025/wolf359/"><h2>Exoplanets Need to be Prepared for Extreme Space Weather, Chandra Finds</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2025/cloud/cloud.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2025/cloud/"><h2>X-ray Echoes Reveal the 3D Structure of Molecular Clouds in our Galaxy's Center</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2024/ngc602/ngc602.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2024/ngc602/"><h2>NASA Missions Spot Cosmic 'Wreath' Displaying Stellar Circle of Life</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2024/cena/cena.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2024/cena/"><h2>NASA's Chandra Sees Black Hole Jet Stumble Into Something in the Dark</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2024/guitar/guitar.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2024/guitar/"><h2>NASA's Chandra, Hubble Tune Into 'Flame-Throwing' Guitar Nebula</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2024/lid568/lid568.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2024/lid568/"><h2>Astronomers Find Early Fast-Feeding Black Hole Using NASA Telescopes</h2></a> </div></div> <div class="item"> <div class="fill" style="background-image:url(https://chandra.harvard.edu/photo/2024/cygob2/cygob2.jpg);"></div> <div class="carousel-caption"> <a href="https://chandra.harvard.edu/photo/2024/cygob2/"><h2>Planets Beware: NASA Unburies Danger Zones of Star Cluster</h2></a> </div></div> </div> <a class="left carousel-control" href="#myCarousel" data-slide="prev"> <span class="icon-prev"></span> </a> <a class="right carousel-control" href="#myCarousel" data-slide="next"> <span class="icon-next"></span> </a> </div> <div id="portal" class="container"> <div class="row links"> <div class="col-lg-12"> <h1 class="page-header">Chandra Portal</h1> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4> Proposer</h4> </div> <div class="panel-body"> <p><a href="/proposer/">Main Proposer Page</a></p> <p><a href="/proposer/CPS.html">Chandra Proposal Software (CPS)</a></p> <p><a href="/proposer/faqs.html">Proposal FAQ</a></p> <p><a href="/proposer/Chandra_RfO.html">DDT and TOO</a></p> <p><a href="/obsvis/">ObsVis</a></p> <p><a href="/soft/provis/">PRoVis</a></p> </div> </div> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4> Observations and Schedules</h4> </div> <div class="panel-body"> <p><a href="/target_lists/longsched.html">Long Term Schedule</a></p> <p><a href="/target_lists/stscheds/index.html">Short Term Schedule</a></p> <p><a href="/cdo/observation_scheduling.html">Observation Scheduling and Support</a></p> <p><a href="/target_lists/index.html">Cycle Targets and Statistics</a></p> <p><a href="/cdo/special_calls.html">Special Calls for Proposals</a></p> </div> </div> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4> Archive and Data Processing</h4> </div> <div class="panel-body"> <p><a href="http://cda.harvard.edu/chaser/">ChaSeR</a>: query Chandra observations</p> <p><a href="/cda/">Chandra Data Archive</a></p> <p><a href="https://cxcfps.cfa.harvard.edu/cda/footprint/cdaview.html">Footprint Service</a></p> <p><a href="/cda/repro4.html">Reprocessing Information</a></p> <p><a href="/csc/">Chandra Source Catalog</a></p> <p><a href="http://tgcat.mit.edu">TGCAT: Grating Data Catalog and Archive</a></p> </div> </div> </div> </div> <div class="row links"> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4> Data Analysis</h4> </div> <div class="panel-body"> <p><a href="/ciao/">CIAO Software Package</a></p> <p><a href="/ciao/threads/">Data Analysis Threads</a></p> <p><a href="/sherpa/">Sherpa Modeling and Fitting</a></p> <p><a href="https://github.com/sherpa/sherpa">Sherpa on Github</a></p> <p><a href="/ciao/download/contrib.html">Contributed/Related Software</a></p> <p><a href="/caldb/">Calibration Database</a></p> </div> </div> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4>User Community</h4> </div> <div class="panel-body"> <p><a href="/cdo/cuc/">Chandra Users' Committee (CUC)</a></p> <p><a href="/fellows/">NASA Hubble Fellowship Program</a></p> <p><a href="/announcements/">Announcements</a></p> <p><a href="/cdo/RVP.html">Visit Collaborators at the CXC</a></p>  <p><a href="/cdo/conf.html">Workshops and Symposia</a></p> <p><a href="https://cxc.cfa.harvard.edu/rws/peer_review/index.php">Peer Review Website</a></p> <p><a href="/cdo/tdwg.html">Time Domain Working Group</a></p> </div> </div> </div> <div class="col-md-4"> <div class="panel panel-default"> <div class="panel-heading"> <h4>Publications</h4> </div> <div class="panel-body"> <p><a href="/newsletters/">Newsletters</a></p> <p><a href="http://cxc.cfa.harvard.edu/cgi-gen/cda/bibliography">Chandra Bibliography Search</a></p> <p><a href="/cda/bibstats/bibstats.html">Chandra Bibliography Statistics</a></p> <p><a href="http://chandra.harvard.edu/press/">Press Releases</a></p> <p><a 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