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   62042
   We propose ASCA/RXTE observations of Cir X-1 during one of its zero
   phase transitions. An earlier, short ASCA observation showed strong and
   variable iron K spectral features, and we want to study these features
   for more time to test the direct flux plus scattered flux model that we
   have put forward. RXTE observations, despite their low spectral
   resolution, suggest that the earlier ASCA observation probably missed
   some interesting spectral behavior that would greatly benefit from a
   higher spectral resolution study. The iron K line appears to vary in
   equivalent width and the iron K edge threshold energy appears to
   increase up to 7.7 keV. The high spectral resolution of ASCA coupled
   with the broad band and large effective area of RXTE will allow the
   best spectral study of Cir X-1 yet.
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