The gravitational wave detectors run by LIGO/VIRGO collaboration have detected 4 gravitational wave (GW) signals from merging BHs. The data from the last (second) observational run are still being analyzed
and more detections might be announced shortly. The ground-based detectors are now offline for the further upgrade, and we expect a significant increase in the detection rate in the next observational period. In addition, the preparations for the space-based GW observatory, LISA, have already started. The LISA data will