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   51054
   A 40 ksec follow-up observation of Cen X-4 is proposed to confirm the
   31 msec pulsations detected in the AO-1 data in 95% confidence level.
   If the pulsation is detected at the same sets of orbital parameters and
   at the same frequency, the significance of pulsations increases by more
   than several orders of magnitude. If the detection is confirmed, this
   will be the firm evidence of the pulsar recycle senario, and imposes
   strong constraints on the strength of the magnetic field of neutron
   star in low mass X-ray binaries.
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