Optical Identification of the ASCA Large Sky Survey

Department of Astronomy, Kyoto University, Kyoto 606-8502, Japan Astronomical Institute, Tohoku University, Sendai 980-8578, Japan National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588, Japan Department of Astronomy, University of Tokyo, Tokyo 113-8658, Japan Department of Physics, Kyoto University, Kyoto 606-8502, Japan Institute of Space and Astronautical Science, Kanagawa 229-8510, Japan Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany MPI für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany Visiting Astronomer, German-Spanish Astronomical Centre, Calar Alto, operated by