Analysis of the Green Bank radio data was performed by fitting single elliptical
Gaussian surfaces to local enhancements (Neumann et
al. 1994). The final catalog contains 
small
diameter sources above a detection threshold of 3
. The flux density
limit is 
15 mJy in the declination range from 
and increases to 
24 mJy at 0
declination. In order to
identify as many radio-emitting objects in the RASS as possible, this list
was purposely constructed to be deeper than those lists published later
(Becker et al. 1991; Gregory &
Condon 1991), which are restricted to >5
sources. The
initial radio source catalog is therefore likely to contain many faint
spurious sources. The rate of spurious coincidences in the overall
RASS-Green Bank correlation ought to be much less, however, since close
proximity (100
) to a detected X-ray source is required. The
1
positional accuracy of the Neumann et al.
(1994) Green Bank catalog is approximately 
15
for bright sources and 
40
for fainter ones
(Neumann et al. 1994). Direct comparison of the
reanalyzed GB flux densities with those published in GB96
shows that for sources >100 mJy the flux densities are accurate to
20% while for sources <100 mJy the flux densities differ by up to
40%, with the reanalyzed values generally being higher.
The RASS data were processed using the semi-automatic Standard Analysis Software System (SASS; Voges et al. 1992) which determines the sky coordinates and energy of each photon by applying an aspect solution and calibration to each X-ray event. The data are then analyzed using various source detection algorithms, comprising two sliding window techniques and a maximum-likelihood method. Further details are given in Voges (1993).
The RASS and GB surveys were cross-correlated producing a catalog of 2,127
sources with separations of <100
. These sources are listed in
Tables 2-4 below. The distribution of the separations is well represented by a
Gaussian with 
17
for distances up to 40
and
is approximately constant beyond this (Fig. 1 (click here), B95). Because of the highly
non-Gaussian nature of the distribution, sources with RASS/GB separations of up
to 100
were included in this initial catalog. The number of spurious
coincidences is believed to be less than 200 objects (B95). The radio flux
densities range from 15 mJy to 60 Jy and the X-ray fluxes range from
to 
.