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   PR # 21076
    Neutron stars have been identified in less than one dozen of the 170 
    Galactic SNRs.  Continued identification of more such associations in
    needed to understand the SNR phenomena.Conversely,the distribution of
    magnetic field strength and initial periods can be directly inferred 
    from young pulsars. Thus there is considerable motivation to search  
    for young pulsars and characterize their associated synchrotron nebul
    ae, the plerions, in SNRs.  We note that X-ray is one of the most pow
    erful band since PSR1509-58 and 0540-63 were found in X-rays.  System
    atic  observations of plerions will be revealed the evolution of the 
    pulsar  magnetosphere, namely the mechanism of pulsar wind.  Here we 
    propose to observe 3C58 and G291.0-0.1, they appear to be evolved    
   version of the Crab nebula.   
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