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We present results of timing observations of the 143-ms pulsar J0538+2817 that provide a proper motion measurement which clearly associates the pulsar with the supernova remnant S147. We measure a proper motion of 67-₂₂^+48 mas yr^-1, implying a transverse velocity of v= 385^+260-₁₃₀ km s^-1. We derive an age of the pulsar and S147 of only 30pm4 kyr which is a factor of 20 times less than the pulsar's characteristic age of tauc = 620 kyr. This age implies an initial spin period of P₀=139 ms, close to the present pulse period and a factor of several larger than what is usually inferred for birth periods. Implications for recent X-ray detections of this pulsar are discussed.
Krämer et al. (Wed,) studied this question.