Quoting myself from an earlier discussion. A-LIGO is still down for upgrades for the O3 run scheduled in the autumn.Since it's detection of GW150914, How many BH BH mergers has it detected and how many BH NS mergers has it detected, Is it living up to the potential detection's that are predicted?
The original LIGO equipment was much less sensitive than the Advanced LIGO that started gathering data for the first (01) run September 12, 2015 and found the first confirmed merger two days later. Before the first run was ended January, 2016 it discovered one candidate and one additional confirmed merger.
The second more sensitive O2 run started November 30, 2016 but was was suspended between May 8 and June 8 for maintenance, Virgo joined the two LIGOs on August 1 and the run was shut down August 25. This run discovered four mergers, two of them in August alone.