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   71007
   We propose monitering observation of 1E1841-045 in Kes 73, which has
   recently been rediscovered as a 11-sec pulsar. It has extremely strong
   surface magnetic field of 8 x 10^14 gauss and one of the stongest
   candidate of the magnetar. Combining the 4 succeeding observations
   lasting for about 700 ksec, we are going to study its timing
   irregularity and obtain the period derivative and its second
   derivative. The observation must provide us keys for the inner
   structure of neutron stars and their origin of strong magnetic field.
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