******************************************************                         
    PR # 32128                                                                   
     We propose three observations of the supernova remnant CTB109 to            
     compare the evolutionary state of dramatically different regions            
     within the remnant. CTB109 has a spectacular semi-circular morphology       
     where the eastern half of the remnant appears to have expanded              
     relatively unimpeded into a low-density medium and the western half         
     appears to have been completely constrained by a dense molecular            
     cloud complex.  The ROSAT results indicate that the shock/cloud             
     interaction region is not in the evolutionary state predicted by            
     models of CTB109.  These observations will resolve this discrepancy,        
     while completing the coverage of CTB109 by ASCA.                            
                                                                                 
                                                                                 
  ******************************************************