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   PR # 42074
   The canonical model of neutron star birth in Type II \& Ib
   supernovae, receives at best modest observational support from the
   list of radio pulsars associated with supernova remnants (SNR).
   Although the ($\sim 20$) positive associations do uphold the
   scenario, one is left wondering as to why there are so few. An
   indirect but effective means of inferring pulsars inside remnants is
   by observations of their wind nebulae (plerions). However Galactic
   studies of SNR indicate a clear deficit of plerions. This could be an
   artifact of the numerous selection effects working against the
   discovery of these objects and we exemplify this point with our
   recent ASCA SNR observations.......
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