ROSAT/Vars ivo://nasa.heasarc/rassvars NASA/GSFC HEASARC Fuhrmeister, Schmitt 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The RASS X-Ray Variable Sources Catalog contains the results of a systematic search for variability among the ROSAT All-Sky Survey (RASS) X-ray sources. Lightcurves were generated for about 30,000 X-ray point sources which were detected sufficiently high above the background. For the variability study different search algorithms were developed in order to recognize flares, periods and trends, respectively. The variable X-ray sources were optically identified with counterparts in the SIMBAD, the USNO-A2.0 and NED data bases, but a significant part of the X-ray sources remain without cataloged optical counterparts. A complete list of the 1207 X-ray variable sources that were found is presented in this table. This table was created by the HEASARC in July 2003 based on CDS table J/A+A/403/247/table7.dat. This is a service provided by NASA HEASARC . 2003A&amp;A...403..247F https://heasarc.gsfc.nasa.gov/W3Browse/all/rassvars.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rassvars& GET text/xml 180 99999 true 114.69329167 -88.67983333 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rassvars GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rassvars&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0333333333333333 X-ray public rassvars RASS X-Ray Variable Sources Catalog name Sequentially Numbered 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 alt_name Identifier of the Source meta.id char nullable source_type Type of Source src.class 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 vmag V Magnitude from USNO-A2 Catalog <I/252> phot.mag;em.opt.V float nullable bii Galactic Latitude degree pos.galactic.lat double nullable auto_period_flag Flag Indicates Period Automatically Found meta.code;time.period short nullable period_flag Flag Indicates Period meta.code;time.period short nullable flare_flag Flag Indicates Flare meta.code short nullable auto_trend_flag Flag Indicates Trend Automatically Found meta.code;phot short nullable source_remarks Remarks on Source meta.note char nullable class Browse Object Classification src.class short nullable lii Galactic Longitude degree pos.galactic.lon double nullable auto_flare_flag Flag Indicates Flare Automatically Found meta.code;time.period short nullable trend_flag Flag Indicates Trend meta.code;phot short nullable note_source_type Note on Type: [UNX] meta.note char nullable bmag B Magnitude from USNO-A2 Catalog <I/252> phot.mag;em.opt.B float nullable