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High magnetic field (high-B) pulsars are key sources to bridge magnetars andconventional rotation powered pulsars, and thus to understand the origin ofmagnetar activities. We have estimated a tight upper-limit on the X-ray flux ofone of the youngest high-B pulsars PSR J1208-6238 for the first time; a Chandra10 ks observation shows no significant source. Depending on the emissionmodels, the 3sigma upper-limit on the intrinsic 0.5-7 keV flux to(2.2-10.0)e-14 erg/s/cm2.

Low X-ray Efficiency of a Young High-B Pulsar PSR J1208-6238 Observed with Chandra