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   71046
   Long-term observations with Ginga ASM, CGRO BATSE, and RXTE ASM have
   revealed that the black hole candidate GX 339-4 is in the high (soft)
   state more frequently than other black hole candidates. These
   observations and those of Cyg X-1 have also shown that, in these
   sources, a hard to soft state transition often occurs after a large
   flare in the hard x-ray (20-200 keV) band. Here we propose a series of
   ASCA observations with RXTE and BASTE and other ground based
   observeratries to reveal true wide band energy spectra.
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