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