Observing Plans

Current Observing Plans

April 10, 2024 -- The second half of O4 (O4b) began on April 10th, 2024 after a nearly 3-month period within which a number of upgrades and maintenance tasks were performed on the Livingston and Hanford detectors. O4 is expected to stretch into early 2025.

For more information, please see:

LIGO/Virgo/KAGRA Statement on Near-term Observing Plans


Future Observing Plans

Plans are currently under development by LIGO to chart a path for interferometer upgrades and observing periods beyond O5 and continuing into the next decade.

LIGO Laboratory Statement on Long-term Future Observing Plans