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    PR # 32129                                                                   
     We propose a single ASCA observation of the supernova remnant               
     MSH15-56.  MSH15-56 is the archtypical example of a ``composite'' SNR       
      in the radio and has a complex center-filled morphology in X-rays.         
      Previous observations with ROSAT have been unable to determine if          
      there is a non-thermal component in the emission from the center of        
      the remnant. Our proposed observation will easily detect the               
      existence of any non-thermal emission and will also produce the firs       
     thigh-resolution X-ray spectrum of the southwest shell of the remnant       
     .We will compare the ASCA data to existing radio observations to            
      determine the evolutionary history of this unique remnant.                 
                                                                                 
                                                                                 
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