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   PR #   160
   Almost all plerionic SNRs are known to have similar energy spectrum in
   X-ray bandtrast to the shell SNRs. It is interupted that the
   synchrotron radiation powered what tures photon indices to single
   value, even though these SNRs may be differe period, magnetic field
   and ISM density. G21.5-0.9 is known to be one of a few puatory}
   revealed the central point-like X-ray emission. Pulsar The aim of the
   obse high energy resolution of SIS and search for pulsar with high
   temporal resolutio
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