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   PR # 41041
   Recent ASCA and ROSAT observations of soft and ultra-soft transients
   in quiescence revealed clear contrast between X-ray characteristics
   of the black hole and neutron star transients. There seems to be
   lower limit in quiescent luminosity of neutron star transients (1E32
   erg/sec), while such limit is not seen in the black hole transients.
   Some of the black hole transients show significant low luminosity
   X-ray emission, which can be approximated by a blackbody of a few
   hundread eV. Origin of this emission is unclear. We propose
   systematic observations of black hole transients in quiescence to
   establish the difference from those including neutron star and to
   uncover the origing of the X-ray emission.
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