The gravitational-wave detector, KAGRA, is unique for its underground site and cryogenic design. The first observation started from 25th February 2020 with a limited sensitivity of 400 kpc for binary neutron star inspirals for two weeks. From 10th to 24th March 2020, the observation is in a brake for further detector commissioning to attain 1 Mpc sensitivity to join LIGO-VIRGO observation network. This paper reviews the commissioning efforts including the lock acquisition procedure of the KAGRA interferometer.
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