Electromagnetic follow-up of gravitational wave sources and the case of GW150914

Simultaneous observations of an electromagnetic counterpart from gravitational wave (GW) sources is a powerful tool to gain a complete understanding of the astrophysical event, as well as to support GW data analysis. This proceeding summarizes the expected electromagnetic counterpart of GW sources detectable by the advanced LIGO and Virgo, the follow-up strategies to detect them with groundand space-based observatories, together with an overview of the follow-up campaign of the first GW signal, GW150914, detected with the Advanced LIGO detectors by the LIGO/Virgo Collaboration team