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   52078
   The association of neutron stars with supernova remnants (SNR) is a
   cornerstone of stellar astrophysics. However, radio pulsars are
   confirmed to be associated with only a dozen Galactic remnants.
   Fortunately, an indirect, but equally effective way to infer the
   presence of a central neutron star in a SNR is by observations of
   pulsar powered synchrotron nebulae (or ``plerions''). Moreover it turns
   out that a complete census of Galactic plerions would shed much desired
   light on birth parameters of neutron stars. Herein we propose to
   observe the Crab-like plerion G\\~{}54.1+0.3. This distant source has a
   hard X-ray spectrum, as observed by EINSTEIN and ROSAT, due to heavy
   foreground absorption. ASCA's hard X-ray capabilities would help
   measure the plerion energy output, determine its age
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