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

Auxiliary Optics Core Optics
Data Acquisition Data and
Input Optics

Advanced LIGO News

Gravitational Waves Detected

On February 11, 2016, the LIGO Scientific Collaboration and the Virgo Collaboration announced the detection of gravitational wave signals from the inspiral and merger of a pair of black holes. The detection occurred on September 14, 2015 at the beginning of LIGO's O1 data run. Displaying the expected "chirp" behavior, meaning that it swept upward in amplitude and frequency, the signal, labeled GW150914, appeared in the data streams of both detectors near 30 Hz and rose to roughly 300 Hz in 0.2 second. The time separation between the signal's arrival in the L1 and H1 detectors was 7 milliseconds. The event would not have registered in LIGO's first-generation detectors; the fact that it appeared with striking clarity in both L1 and H1 indicates the leap in detector performance that the Advanced LIGO program has produced. The LIGO-Virgo Collaboration celebrates this milestone in astronomy and looks forward to a rich future of discoveries.  Image: LIGO.[range]

  Read more at the LIGO Laboratory and LIGO Scientific Collaboration websites.


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