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A catalog containing milliarcsecond--accurate positions of 1332 extragalacticradio sources distributed over the northern sky is presented - the Very LongBaseline Array Calibrator Survey (VCS1). The positions have been derived fromastrometric analysis of dual-frequency 2.3 and 8.4 GHz VLBA snapshotobservations; in a majority of cases, images of the sources are also available.These radio sources are suitable for use in geodetic and astrometricexperiments, and as phase-reference calibrators in high-sensitivityastronomical imaging. The VCS1 is the largest high-resolution radio survey everundertaken, and triples the number of sources available to the radio astronomycommunity for VLBI applications. In addition to the astrometric role, thissurvey can be used in active galactic nuclei, Galactic, gravitational lens andcosmological studies. The VCS1 catalog will soon be available atwww.nrao.edu/vlba/VCS1 .Comment: 25 pages, 5 figures. Accepted to ApJ

The VLBA Calibrator Survey—VCS1