LIGO, VIRGO AND KAGRA OBSERVING RUN PLANS

[15 July 2021 update; next update by 15 September 2021]

The LIGO-Virgo-KAGRA collaborations are making good progress in the updates of the Virgo (where installation of new hardware is complete), KAGRA, and LIGO detectors in preparation for O4. It is not yet possible to give a definitive start date for O4, as there are some continued supply chain delays and the impact of COVID continues. We can say at this time that the O4 observing run will not begin before August 2022. We expect to be able to give a better estimate for the start of O4 by 15 September 2021 and will issue an update then.

If you have any questions, please contact the Spokespersons:

• Patrick Brady (Spokesperson, LIGO Scientific Collaboration); lsc-spokesperson@ligo.org
• Giovanni Losurdo (Spokesperson, Virgo Collaboration); virgo-spokesperson@ego-gw.it
• Hisaaki Shinkai (Board Chair, KAGRA Scientific Congress); kscboard-chair@icrr.u-tokyo.ac.jp