The new world discovered with the detection of Gravitational Waves: the era of public alerts

During the first three observing runs of LIGO/Virgo/KAGRA Collaboration a total of 90 candidate gravitational wave events from the mergers of black hole and neutron stars have been detected. Since then, the O4a run took place and the O4b run is presently ongoing, contributing with the detection of additional mergers. During the runs, all disseminated gravitational events have been the target of multi-messenger follow-up observations, and at the same time, there has been searches of gravitational wave emission from electromagnetic events. The present paper reviews the results of LIGO-Virgo runs with a focus on the runs in the public alert era.