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   PR # 43009
   X-ray emission was discovered from the pulsar PSR J0538+2817 during
   the ROSAT All Sky Survey (RASS). It is the oldest among the neutron
   stars (<10^6 yr) which cooling surface emission is suitable for X-ray
   observation. RASS exposure is, however, not enough to distinguish
   whether it is magneto-rotation driven or cooling emission. The upper
   limit of its gamma-ray emission efficiency is about 0.03, much lower
   than the predictions from both polar cap model and empirical fitting
   of known $\gamma$-ray pulsars, and much lower than in the case of its
   twin-PSR1055-52. The proposed observation would help to clearify the
   nature of the X-ray emission of this pulsar.
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