Here we list several web services which may be helpful for doing research with the XMM-Newton data.

TAP (Table Access Protocol) server

TAP server at CDS VizieR allows you to do large scale cross-matches of your source lists with the XMM-Newton catalog (sources table only): 3XMM-DR5, 3XMM-DR6, 3XMM-DR8, 4XMM-DR9, 4XMM-DR11. Alternatively, in a TAP client of your choice (TOPCAT is a very good option) enter service url http://tapvizier.u-strasbg.fr/TAPVizieR/tap and then use "IX/46/xmm3r5s" for the 3XMM-DR5 sources table name, "IX/50/xmm3r6s" for the 3XMM-DR6 sources table name, "IX/55/xmm3r8s" for the 3XMM-DR8 sources table name,"IX/59/xmm4r9s" for the 4XMM-DR9 sources table name and "IX/65/xmm4d11s" for the 4XMM-DR11 sources table name.

XCatDB

The SSC provides another Web interface based on SAADA and named the XCatDB (http://xcatdb.unistra.fr). Its main features are:

• Access by source or by detection
• Multi criteria search
• Search by sky regions
• Online spectrum fitting
• Pointers to the XMMFITCAT products (http://xraygroup.astro.noa.gr/Webpage-prodex/xmmfitcat_access.html)
• Static correlation links with 220 archival catalogues (computed by the pipeline)