GB6 ivo://nasa.heasarc/gb6 NASA/GSFC HEASARC Gregory, Scott, Douglas, Condon 2026-07-31 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the Green Bank 6-cm (GB6) Radio Source Catalog. The Green Bank 4.85 GHz (6-cm wavelength) survey (Condon J.J., Broderick J.J., Seielstad G.A., Douglas K., & Gregory P.C. in 1994AJ....107.1829C) was made with the NRAO seven-beam receiver on the (former) 91m telescope during 1986 November and 1987 October. The final set of sky maps covering the declination band 0 deg < Dec. < +75 deg was constructed with data from both epochs. Its noise and position errors are nearly a factor of 2^(1/2) smaller than in the epoch 1987 maps, from which the 87GB Catalog (<a href="https://cdsarc.cds.unistra.fr/ftp/cats/VIII/14">CDS Catalog <VIII/14></a>) of 54,579 sources stronger than S ~ 25mJy was extracted. Therefore, the new maps were used to make the GB6 catalog of 75,162 discrete sources with angular sizes phi <= 10.5 arcmin and flux densities S >= 18mJy. The GB6 weighted differential source counts S^(5/2)n(S) between 18 mJy and 7 Jy agree well with evolutionary models based on independent data. This table was created by the HEASARC in July 2003 based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/VIII/40">CDS Catalog <VIII/40></a>. This is a service provided by NASA HEASARC . 1996ApJS..103..427G https://heasarc.gsfc.nasa.gov/W3Browse/all/gb6.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=gb6& GET text/xml 180 99999 true 193.04458333 -0.26861111 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=gb6 GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_gb6&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public gb6 Green Bank 6-cm (GB6) Radio Source Catalog name Source Designation (Based on J2000 Position) meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable ra_error Uncertainty in Right Ascension (s) s stat.error;pos.eq.ra double nullable dec Declination degree pos.eq.dec;meta.main double nullable dec_error Uncertainty in Declination (arcsec) arcsec stat.error;pos.eq.dec short nullable flux_6_cm 4.85-GHz Peak Flux Density (mJy) mJy phot.flux.density;em.radio.3-6GHz int nullable flux_6_cm_error Uncertainty in Peak Flux Density (mJy) mJy stat.error;phot.flux.density;em.radio.3-6GHz short 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 zero_level Local Sky Level (mJy/beam) mJy/beam instr.skyLevel short nullable extent_flag Flag E Indicates Significant Extension meta.code;phys.angSize char nullable lii Galactic Longitude degree pos.galactic.lon double nullable y_pixel Map Pixel Row Number (from Bottom) pixel pos.cartesian.y;instr.pixel short nullable weak_flag Flag W Indicates Warning: Weak Source with Large Zero meta.code.qual char nullable minor_axis Normalized FWHM Minor Axis (Beam Size) beam phys.size.sminAxis double nullable x_pixel Map Pixel Column Number (from Left) pixel pos.cartesian.x;instr.pixel short nullable major_axis Normalized FWHM Major Axis (Beam Size) beam phys.size.smajAxis double nullable border_flag Flag B Indicates Sources Near the Image Border meta.code.qual char nullable bii Galactic Latitude degree pos.galactic.lat double nullable confusion_flag Flag C Indicates Confusion (Near a Stronger Source) meta.code.qual char nullable position_angle Fitted Major Axis Position Angle (degrees east of north) degree pos.posAng short nullable