Advanced LIGO subsystems
are the organizational units of the overall project. Follow the links below to view the mission and progress of each subsystem.

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Advanced LIGO News

LIGO Detects Another Black Hole Merger

On June 15, 2016, LIGO announced the second detection of a gravitational wave signal, GW151226, from the inspiral and merger of a pair of black holes. The detection occurred on December 26, 2015 near the conclusion of LIGO's O1 data run. The signal showed the characteristic "chirp" behavior that the LIGO-Virgo collaboration observed in the previous detection, GW150914; the signal dynamics and the mass estimates of the merging bodies point to black holes. Unlike the black hole merger GW150914, which appeared in LIGO's detectors for about eight wave cycles over a fraction of a second In September 2015, GW151226 persisted for 55 wave cycles that spanned approximately one second. The signal produced a network signal-to-noise ratio of 13. It was identified within 70 seconds of arrival by an online matched-filter search that targets binary coalescences.    [GW151226]

Read more at the LIGO Laboratory and LIGO Scientific Collaboration websites. (Image credit: SXS Collaboration/


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