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   61040
   We propose observations of the violent and enigmatic X-ray binary
   system Cir X-1 over the whole orbital period. Cir X-1 contains a
   neutron star with weak magnetic field, like other low-mass X-ray
   binaries, whereas it exhibits large vriety of enigmatic behaviour,
   whose origin is not known yet. We hope to obtain important information
   on the super-Eddignton accretion, jet formation, partial covering
   absorption, line/edge formation, spectral state variability, and
   Z/atoll source unification scheme through comprehensive asca
   observations. Compariosn with the previous short ASCA observation at
   phase zero is also useful to identify the origin of the long-term
   variation observed by the RXTE.
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