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   71022
   We detected X-ray from Brown Dwarf with ROSAT PSPC. Then we confirmed
   the hard X-ray from the position with ASCA data. There is no other
   catalogued source in 2 arcmin from the position, then this is the first
   discovery of X-ray from BD. There is no theory which predicts strong X-
   ray from BD which is fully convective and has no disk. Accordingly,
   this discovery will require reformation of X-ray emisison mechanism in
   stars in general. The most notable meaning of the discovery of X-ray
   from BD is that it will be powerful tool for BD survey and it will
   pioneer new field of X-ray astronomy. This goal is to confirm the X-ray
   from BD and to discover new X-rays from BDs, to obtain the spectra and
   time variabilities in broad X-ray band, and finaly to investigate the
   X-ray emission mechanism.
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