After 100 years from the formulation of the theory of general
relativity by Albert Einstein, gravitational waves have been finally
observed on September 14, 2015 as a transient signal by the two
detectors of the Laser Interferometer Gravitational-Wave Observatory,
LIGO.
In this mini-workshop the results by LIGO and VIRGO collaborations
will be presented, together with a historical review of gravitational
wave detectors.
Future implications of gravitational waves observation in astrophysics
will be also discussed.