TAMA 300 m laser interferometric gravitational wave detector operated in Au
gust and September 1999. We had total four night operation with best strain
sensitivity of 3 x 10(-20). The longest continuous locking is over 7 hours
. The calibration of the interferometer sensitivity was archived with 1% ac
curacy in Delta h/h. TAMA Phase-I sensitivity is evaluated as S/N similar t
o 10 for 10 kpc event.