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   51132
   We propose the simultaneous monitoring observations of ASCA and VSOP.
   OJ287 is one of the most extensively observed and studied BL Lac
   objects. The measurement of both synchrotron and SSC components is a
   key to evaluate basic parameters associated with radiation fields of
   the jet. but we have to assume geometry. So, it is very important to
   investigate the spatial structure of the jet. Simultaneous ASCA and
   VSOP observation enables us to investigate where X-rays come from, core
   or shock in jet.
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