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   52095
   ROSAT observations of CTA1 reveal a center-filled SNR whose morphology
   and spectrum suggest the presence of a central pulsar. The spectral
   characteristics suggest a dominant central synchrotron nebula
   accompanied by a thermal perimeter which extends to the radio shell.
   Our ASCA observation of the central region confirms the nonthermal
   nature of this emission. Here we propose an ASCA observation along the
   bright southern radio shell. The observation will confirm or refute the
   thermal nature of the emission from the outer regions. If confirmed, it
   will provide a determination of the thermal characteristics of the
   blast wave region and allow a comparison of the central engine
   energetics with the dynamical properties of the blast wave to provide a
   broad picture of the SNR development.
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