See Also: LIGO again detects gravitational waves 

 The scientists detected the gravitational waves using the twin Laser Interferometer Gravitational-wave Observatory (LIGO) interferometers, located in Livingston, Louisiana, and Hanford, Washington. On Dec. 26, 2015, at 3:38 UTC, both detectors, situated more than 3,000 kilometers apart, picked up a very faint signal amid the surrounding noise….. See: For second time, LIGO detects gravitational waves, by Jennifer Chu, MIT News Office

SEE also:

• LIGO detects a second merger of black holes
• LIGO experiment’s discovery of gravitational waves