X-ray ivo://nasa.heasarc/xray NASA/GSFC HEASARC HEASARC 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Compilation Source The XRAY database table contains selected parameters from almost all HEASARC X-ray catalogs that have source positions located to better than a few arcminutes. The XRAY database table was created by copying all of the entries and common parameters from the tables listed in the Component Tables section. The XRAY database table has many entries but relatively few parameters; it provides users with general information about X-ray sources, obtained from a variety of catalogs. XRAY is especially suitable for cone searches and cross-correlations with other databases. Each entry in XRAY has a parameter called 'database_table' which indicates from which original database the entry was copied; users can browse that original table should they wish to examine all of the parameter fields for a particular entry. For some entries in XRAY, some of the parameter fields may be blank (or have zero values); this indicates that the original database table did not contain that particular parameter or that it had this same value there. The HEASARC in certain instances has included X-ray sources for which the quoted value for the specified band is an upper limit rather than a detection. The HEASARC recommends that the user should always check the original tables to get the complete information about the properties of the sources listed in the XRAY master source list. This master catalog is updated periodically whenever one of the component database tables is modified or a new component database table is added. This is a service provided by NASA HEASARC . https://heasarc.gsfc.nasa.gov/W3Browse/all/xray.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=xray& GET text/xml 180 99999 true 273.607230154061 42.0888546623077 0.05 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=xray GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_xray&Action=More+Options&Action=Parameter+Search&ConeAdd=1 MASTER CATALOG 0.05 X-ray public xray Master X-Ray Catalog name Common Source Designation meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable count_rate Count Rate (counts/sec) ct/s phot.count;em.X-ray double nullable count_rate_error Error in Count Rate ct/s stat.error;phot.count;em.X-ray double nullable flux Flux (erg/cm^2/s) erg/cm^2/s phot.flux;em.X-ray double nullable database_table Database Table This Entry Comes From meta.dataset;meta.table char nullable observatory Observatory or Mission Name That Originated the Database Table meta.id;instr.obsty char nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable exposure Exposure Time (seconds) s time.duration;obs.exposure int nullable error_radius Positional Uncertainty (arcsec) arcsec stat.error;pos float nullable bii Galactic Longitude degree pos.galactic.lat double nullable class Browse Object Classification src.class short nullable lii Galactic Latitude degree pos.galactic.lon double nullable