RASS/BSC ivo://nasa.heasarc/rassbsc NASA/GSFC HEASARC Voges et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The ROSAT All-Sky Survey Bright Source Catalog (RASS-BSC, revision 1RXS) was released online at <a href="http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/">http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/</a> (cf. IAU Circular No. 6420, June 19, 1996). It has been superseded by the <a href="/W3Browse/rosat/rass2rxs.html">Second ROSAT All-Sky Survey Point Source Catalog (2RXS)</a>. This catalog was derived from the all-sky survey performed during the first half year of the ROSAT mission in 1990-1991; 18,811 sources are catalogued, with a limiting ROSAT PSPC countrate of 0.05 cts/s in the energy band 0.1- 2.4 keV. The sources have a detection likelihood of at least 15 and contain at least 15 source photons. At a brightness limit of 0.1 cts/s (8547 sources), the catalog represents a sky coverage of 92 percent. The ROSAT name, the position in equatorial coordinates, the positional error, the source countrate and error, the background countrate, exposure time, hardness-ratios HR1 and HR2 and errors, extent and likelihood of extent, and likelihood of detection are provided for each source. For 94 percent of the sources, visual inspection confirmed the results of the standard processing with respect to existence and position; the remaining 6 percent were reanalyzed and appropriately flagged. Broadband images are available for a subset of the flagged sources. This table was originally ingested by the HEASARC in June 1996, based upon the data files from <a href="http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/">http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/</a>. An updated version can be found in the <a href="https://cdsarc.cds.unistra.fr/ftp/cats/IX/10A">CDS Catalog IX/10A</a>. This is a service provided by NASA HEASARC . 1999A&A...349..389V https://heasarc.gsfc.nasa.gov/W3Browse/all/rassbsc.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rassbsc& GET text/xml 180 99999 true 162.69666 -88.99778 0.0333333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rassbsc GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rassbsc&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0333333333333333 X-ray public rassbsc ROSAT All-Sky Survey: Bright Sources name Source Name meta.id;meta.main char nullable ra Right Ascension J2000 coordinates degree pos.eq.ra;meta.main double nullable dec Declination J2000 coordinates degree pos.eq.dec;meta.main double nullable count_rate Source Count Rate ct/s phot.count;em.X-ray double nullable count_rate_error Source Count Rate Error ct/s stat.error;phot.count;em.X-ray double nullable hardness_ratio_1 Hardness Ratio 1 phot.count;arith.ratio;em.X-ray double nullable hardness_ratio_1_error Hardness Ratio 1 Error stat.error;phot.count;arith.ratio;em.X-ray double nullable background_count_rate Background Count Rate ct/s/arcmin^2 instr.background double nullable positional_error Total Positional Error arcsec stat.error;pos short nullable date_included Date Source Included char nullable bii Galactic Latitude degree pos.galactic.lat double nullable sass_field_id SASS Field ID Number meta.id;obs.field char nullable high_detect_range PHA Range with Highest Detection Likelihood meta.code char nullable dec_b1950 Declination 1950 coordinates degree pos.eq.dec double nullable ra_b1950 Right Ascension 1950 coordinates degree pos.eq.ra double nullable detect_likelihood Likelihood of Detection Algorithm stat.likelihood int nullable hardness_ratio_2_error Hardness Ratio 2 Error stat.error;phot.count;arith.ratio;em.X-ray double nullable new_data_flag New Data Flags meta.code char nullable hardness_ratio_2 Hardness Ratio 2 phot.count;arith.ratio;em.X-ray double nullable source_extent Source Extent arcsec phys.angSize;src int nullable date_modified Date Source Properties Changed char nullable screen_flag Screening Flags meta.code char nullable vignetting_factor Vignetting Factor instr.param double nullable exposure Exposure (seconds) s time.duration;obs.exposure int nullable extraction_radius Extraction Radius arcsec int nullable extent_likelihood Likelihood of Source Extent stat.likelihood int nullable lii Galactic Longitude degree pos.galactic.lon double nullable priority_flags Priority Flags meta.code char nullable sass_source_number SASS Source Number meta.id 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