*************************************************************************
   81405
   We propose simultaneous X-ray and gamma-ray observations of microquasar
   GRS~1915+105 with ASCA and CGRO over a week. The purpose of this
   observation is to make the singularity of microquasars clear by
   understanding the origin of gamma-ray continuum, so-called 'hard tail'
   and the origin of highly ionized plasma which produces resonance
   absorption lines. GRS~1915+105 is one of the most brightest and
   variable X-ray sources, whose time scale of the variability is between
   several micro seconds and several months, but no one has investigated
   the long intensity variation in the multi-wavelength yet. This
   observation will be last possible opportunity for long, coordinated,
   broadband coverage. So we think that ASCA has to take the leadership of
   this campaign.
 *************************************************************************