The catalog created from the ROSAT All-Sky Survey (RASS) consists of
sources making it the deepest complete sample of soft X-ray
(
) sources ever constructed (Voges
1993). Previous X-ray surveys such as the HEAO-1 Large Area Sky
Survey (Wood et al. 1984), the Einstein Extended Medium
Sensitivity Survey (Gioia et al. 1990;
Stocke et al. 1991), and the Einstein Slew Survey
(Elvis et al. 1992), consisted of less than 5 000 sources
total. Identification programs of these earlier surveys showed the majority
of objects are extragalactic consisting mainly of quasars, Seyferts, BL
Lacertae objects, clusters of galaxies and occasionally normal galaxies.
Similarly, the bulk properties of various samples of optically identified
objects in the RASS (e.g. Brinkmann et al. 1994;
Brinkmann et al. 1995; Bade et
al. 1995) have shown that the RASS contains thousands of
extragalactic objects and will therefore provide the largest flux-limited
sample of X-ray-emitting AGN for the foreseeable future.
Because RASS positions are known to only 
30
accuracy, complete
identification of the entire RASS catalog is an enormous task. Correlations
with deep surveys at other wavelengths can efficiently create subsamples of
manageable size and also select objects of particular interest. We present
here 2,127 sources which appear in both the RASS and the 1987 Green Bank (GB)
5GHz radio survey (Gregory & Condon 1991;
Gregory et al. 1996, hereafter called
GB96). Because >70% of the sources in this RASS-Green
Bank (RGB) sample are optically unidentified and the positional accuracy of
both surveys is low, we obtained high resolution radio observations to
enable the identification of unique optical counterparts. Out detection of
compact core radio components of these radio-loud active galaxies together
with GB observations of the total radio emission, permits study of the
beaming characteristics of these RASS sources. The multiwavelength
properties of the previously optically identified sources appear in
Brinkmann et al. (1995, B95) and multiband
radio observations of a subset are given by Neumann et
al. (1994).
This paper is organized as follows: the construction of the RGB catalog is discussed in Sect. 2 and the new radio data presented in Sect. 3. In Sect. 4 we compare our results to the Green Bank data. Section 5 uses simple beaming models to characterize the radio emission of the sources in our catalog and Sect. 6 discusses the X-ray beaming properties. The broadband multifrequency properties of the entire RGB catalog, including newly identified optical counterparts and X-ray properties, will be presented in Brinkmann et al. (1996; B96).