RASS/RBS ivo://nasa.heasarc/rbs NASA/GSFC HEASARC Schwope et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The ROSAT Bright Survey (RBS) is an identification program of the more than 2000 X-ray sources at high galactic latitude (absolute latitude b > 30 degrees) with a count rate of more than 0.2 ct/s detected during the ROSAT All-Sky Survey (Voges et al. 1999, A&A, 349, 389). The RBS identification program is more than 99.5% complete. A sub-sample of 931 sources with a count rate of more than 0.2 ct/s in the hard spectral band from 0.5 to 2.0 keV is 100% identified. The total survey area comprises 20391 square degrees at a flux limit of 2.4 x 10<sup>-12</sup> erg/s/cm<sup>2</sup> in the 0.5 to 2.0 keV band. About 1500 sources of the complete sample were identified by correlating the RBS with the SIMBAD and NED databases. The remaining ~500 sources were identified by low-resolution optical spectroscopy and CCD imaging utilizing various telescopes. The RBS Catalog contains optical and X-ray information for each source, including the most massive complete sample of X-ray selected AGN ever assembled, with a total of 669 members, and a well-populated X-ray selected sample of 302 clusters of galaxies with redshifts of up to 0.52. Three X-ray sources in the RBS remain without optical counterparts, RBS 378, RBS 1223, and RBS 1556. While the first is a possible X-ray transient, the latter two sources are isolated neutron star candidates (Motch et al. 1999, A&A, 351, 177; Schwope et al. 1999, 341, L51). As noted elsewhere, this electronic version of the RBS Catalog has a small number of additions/corrections compared to the published version. This database was created by the HEASARC in August 2000 based on a machine-readable table supplied to the HEASARC by Axel Schwope in April 2000. Note that this table is an expanded version of Table 2 in the published paper and contains the following additional parameters: HR2 (hardness_ratio_2), and the Galactic hydrogen column density (nh_21cm). This is a service provided by NASA HEASARC . 2000AN....321....1S https://heasarc.gsfc.nasa.gov/W3Browse/all/rbs.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=rbs& GET text/xml 180 99999 true 359.55125 -86.44139 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=rbs GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_rbs&Action=More+Options&Action=Parameter+Search&ConeAdd=1 ROSAT 0.0166666666666667 X-ray public rbs ROSAT Bright Survey (Schwope et al. 2000) rxs RXS X-ray Source Designation meta.id char nullable ra Right Ascension of X-ray Source degree pos.eq.ra;meta.main double nullable dec Declination of X-ray Source degree pos.eq.dec;meta.main double nullable count_rate Total Count Rate (ct/s) ct/s phot.count;em.X-ray.soft double nullable hard_count_rate Hard Count Rate (ct/s) ct/s phot.count;em.X-ray.soft double nullable hardness_ratio_1 Hardness Ratio HR1 phot.count;arith.ratio;em.X-ray.soft double nullable name Optical Counterpart Name meta.id.assoc char nullable error_radius 1-Sigma Error Radius (arcsec) arcsec stat.error;pos;em.X-ray short nullable lii Galactic Longitude of X-ray Source degree pos.galactic.lon double nullable redshift Redshift src.redshift double nullable rbs_number RBS Catalog Number meta.id;meta.main short nullable app_mag_flag Apparent Magnitude Flag meta.code;phot.mag;em.opt char nullable comment_flag Comment Flag meta.note char nullable app_mag Apparent Magnitude phot.mag;em.opt double nullable source_type Specific Source Type src.class char nullable hardness_ratio_2 Hardness Ratio HR2 phot.count;arith.ratio;em.X-ray.soft double nullable flux X-ray Flux (erg/cm^2/s) erg/cm^2/s phot.flux;em.X-ray.soft double nullable nh_21cm Hydrogen Column Density in 10^20 atoms/cm^2 10^20_atoms/cm^2 phys.columnDensity double nullable broad_class Broad Object Class src.class char nullable dec2000_optical Declination of Optical Source in J2000, sexagesimal format pos.eq.dec;em.opt char nullable log_lx Log of X-ray Luminosity phys.luminosity;em.X-ray.soft double nullable bii Galactic Latitude of X-ray Source degree pos.galactic.lat double nullable redshift_flag Redshift Flag meta.code;src.redshift char nullable class Browse Object Classification src.class short nullable log_xray_opt Log of Ratio of X-ray and Optical Fluxes phot.flux;arith.ratio;em.X-ray;em.opt double nullable ra2000_optical Right Ascension of Optical Source in J2000, sexagesimal format pos.eq.ra;em.opt 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 off_set X-ray-Optical Offset (arcsec) arcsec pos.angDistance;em.X-ray;em.opt short nullable