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   81205
   We propose to observe the compact source at the geometrical center of
   the shell-type supernova remnant RCW103. The source has been considered
   to be an isolated neutron star formed by the supernova explosion.
   Recent ASCA observations showed that its flux varies more than an order
   of magnitude on the timescale of years. Such behavior can not be
   explained by standard model such as a rotation powered pulsar or a
   cooling neutron star. We propose a long term observation to clarify its
   nature.
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