  We consider the prospects for a complete survey of the 18,811 sources of the
ROSAT All-Sky Survey Bright Source Catalog (BSC) with NASA's Swift gamma-ray
burst (GRB) mission. By observing each BSC source for 500 s with the
satellite's imaging X-ray and UV/optical telescopes, this "Swift Bright
(Source) Catalog Survey" (Swift-BCS) would derive <5'' source positions for all
BSC sources that have not faded substantially from their ROSAT-era flux levels,
and provide 0.2-10 keV X-ray and UV or optical flux measurements. The
improvement by a factor of 10 to 30 in the two-dimensional localization for
these sources will enable optical identifications or deep limits in nearly
every case, fulfilling the promise of the BSC as a multiwavelength catalog, and
allowing the full enumeration of its rare source populations. Since the
Swift-BCS can be accomplished with 10% of the time on-orbit, for a three-year
mission, and since its targets will be of lower priority than active
afterglows, it will not conflict with the primary Swift mission of GRB
follow-up observations. Moreover, the BSC targets can be scheduled so as to
advance the secondary goals of Swift: Daily monitoring of the full sky in the
hard X-ray band (source fluxes of >~20 mCrab, 10-100 keV) with the wide-field
Burst Alert Telescope (BAT); and a two-year all-sky BAT survey down to >~1
mCrab. The resulting expansion of the catalog of identified X-ray sources from
2000 to 18,000 will provide a greatly-enriched set of targets for observation
by XMM-Newton, Chandra, and future high-energy observatories.
