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    PR # 32227                                                                   
     The detection of gamma-ray emission from 3C279, and subsequently from       
     some 30 OVV quasars, was one of the great discoveries of the Compton        
     GRO.  While Comptonization is the most likely mechanism for the             
     gamma-rays, the source of the soft photons is still a mystery: are          
     they Comptonized synchrotron photons, produced in the same jet as the       
     gamma-rays (as in Synchrotron-self-Compton models), or is it                
     Comptonized external, diffuse ultraviolet radiation?  The                   
     simultaneous X-ray/gamma-ray observations provide such a crucial            
     test, specifically as to the nature of the break between the X-ray          
     and gamma-ray regimes.  We propose Asca observations of an object CTA       
     102, to be coordinated with the EGRET GRO (for which we have an             
    approved observation), to test                                               
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