The IAC has participated in the detection of the counterpart, in the visible, the infrared and X-rays, of the source of gravitational waves GW170817 (neutron stars merging). The results are being published in the journals Nature and Astrophysical Journal. This is the first time that the electromagnetic counterpart of a gravitational wave event has been detected, which has been announced this morning in pressconferences organized by the research groups involved, among them the Universidad de las Illes Balears and the Universidad de Valencia, along with large part of the astrophysic and