Radio, optical, and X-ray data for the sources in the revised GB/GB2 sample are summarized in Table A3 (click here), whose format is as follows:
Column 1: IAU-format source name.
Column 2: Sequence of 10 consecutive marks indicating whether the source appears in the following catalogues: (1) 151 MHz: 6CII, III, VI (Hales et al. 1993; and references therein), (2) 178 MHz: 4C (Pilkington & Scott 1965; Gower et al. 1967), (3) 365 MHz: Texas (Douglas et al. 1980), (4) 408 MHz: B2 (Colla et al. 1972; 1973), (5) B3 (Ficarra et al. 1985), (6) 750 and 1400 MHz: NRAO (Pauliny-Toth et al. 1966), (7) 966 MHz: Jodrell Bank (Cohen et al. 1977; Porcas et al. 1980), (8) 1400 MHz: 83GB (Condon & Broderick 1985; White & Becker 1992), (9) 4830 MHz: MGII (Langston et al. 1990); MGIV (Griffith et al. 1991), (10) 4850 MHz: GB6 (Gregory et al. 1996). "*"-presence; "/"-absence; "c"-flux contaminated by confusing source or sources; "r"-source resolved, flux underestimated.
Column 3: "1", "2", and "3" denotes that the source belongs to Subsample 1,
2, and 3, respectively. "1, 2" denotes sources with 
in the area
of 
, and "2, 3" denotes sources with 
in the
area of 0.0550 sr.
Column 4: Weighted mean 1.4-GHz flux density and its rms error (in mJy). "v" denotes the standard deviation of variable flux (given in parentheses) instead of error of the mean.
Column 5: Slope of the fitted spectrum at 1.4 GHz and its rms error. The
slope is the derivative of a function y=a+bx+cx2 or
(cf. Sect. 3.1). If no function could be fitted to
the spectral data (generally for variable sources), a crude slope at 1.4 GHz is
given in parentheses.
Column 6: Type of radio spectrum (cf. Sect. 3.1).
Column 7: Radio morphology (cf. Sect. 3.2). FRI-edge-darkened double, FRII-edge-brightened double (Fanaroff & Riley 1974); C-compact, unresolved; C(1s), C(2s)-core-dominated compact with one-sided or two-sided extended emission, respectively. "cc" appended to the type denotes that a compact core has been detected, "CSS"-compact steep-spectrum, "Di"-diffuse emission.
Column 8: Largest angular size in arcsec.
Column 9: Code concerning the VLA maps available. "1.4" and sometimes "4.9 indicate observing frequency, and upper-case letters -- VLA configuration used for observations ("P" means partially completed VLA in 1980). An asterisk (*) denotes that no map is available, and the source is represented by fitted Gaussian components only. If a VLBI-scale structure has been observed in the compact source, this is indicated.
Column 10: Source name repeated.
Column 11: Optical type. GAL -- galaxy confirmed spectroscopically and/or with an extended image; (GAL) -- possibly a galaxy; GAL? -- identification ambiguous; QSO -- quasar confirmed spectroscopically; BL -- BL Lac object; RSO, NSO, BSO -- red, neutral, and blue stellar object, respectively (most of NSOs and BSOs are quasar candidates); RO, BO -- red, and blue object too faint to be recognized as stellar or extended. EF -- "empty field" source, an identification likely beyond the POSS limit. "X" preceding the type indicates that an X-ray source coincides with the radio position.
Column 12: Redshift. A value in parentheses has been estimated from the apparent magnitude and colour (cf. Sect. 4.2).
Columns 13 and 14: R- and B-magnitudes. Two decimal digits precision indicate magnitudes measured with photoelectric or CCD photometry.
Columns 15 and 16: J(2000) sky coordinates. "o" preceding right ascension denotes the optical object's position. For double source without a radio core, the given position corresponds to a radio centroid.
Column 17: References to the large-scale radio structure and VLA maps, VLBI-scale structure, photometry, and redshift.
Column 18: "+" marks that a note to the source is appended.