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   71042
   We propose an ASCA observation of Cygnus X-3 during a major radio
   outburst. Recently,Waltman et al. reported the observation of a
   quenched radio emission on a time scale of a few days to a few weeks
   prior to a major flare in Cygnus X-3. If this common feature to
   previous major outbusts is observed ,we will be able to catch an X-ray
   emission onset of a radio jet. This will allow us to study relations
   between X-ray radiation and radio jet ,and photoionized plasma around a
   jet with the high-quality X-ray spectroscopy of ASCA.
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