We present the first volume of the Einstein quasar database. The database includes estimates of the X-ray count rates, fluxes, and luminosities for 514 quasars and Seyfert 1 galaxies observed with the Imaging Proportional Counter (IPC) aboard the Einstein Observatory. All were previously known optically selected or radio-selected objects, and most were targets of the X-ray observations. The X-ray properties of the AGNs have been derived by reanalyzing the IPC data in a systematic manner to provide a uniform database for general use by the astronomical community. We use the database to extend earlier quasar luminosity studies which were made using only a subset of the currently available data. The database can be accessed on Internet via the SAO Einstein on-line system ("Einline") and is available in ASCII format on magnetic tape and DOS diskette. Addresses: Wilkes B. wilkes@cfa.harvard.edu Tananbaum H. ht@cfa.harvard.edu Worrall D.M. dmw@cfa.harvard.edu Flanagan J. Harvard/Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge MA 02138 Avni Y. Harvard/Smithsonian Center for Astrophysics, Deceased Oey M.S. oey@as.arizona.edu Steward Observatory, Tucson, AZ 85721

Cone search capability for table J/ApJS/92/53/table1 (Quasars and Seyfert 1 galaxies included in database)