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    PR # 31165                                                                   
     3C279 is a typical OVV quasar with high variability in radio through        
     GeV-gamma-ray, and the brightest GeV-gamma-ray AGN. The property in r       
     adio to X-rays will strongly support the SSC model. However, bright G       
     eV-gamma-ray flux by CGRO cannot be explained by this model. The rese       
     arch of GeV-gamma-ray emission mechanism unknown is expected to lead        
     the evidence of blazar activity, like as jets and relativistic electr       
     on production. Recently the re-brightening at visible band was report       
     ed. We would expect return of the X-ray/Gamma-ray activity, and would       
      propose here the long term X-ray monitoring of 3C279 simultaneously        
     with CGRO, IUE and HST in order to establish the emission mechanism o       
     f GeV-gamma-ray.                                                            
                                                                                 
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