July 15th, 2021

[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

▲Back to TOP

June 29th, 2021

(from https://www.ligo.org/science/Publication-NSBHDiscovery/)

On January 5th 2020, the Advanced LIGO detector in Livingston, Louisiana in the US and the Advanced Virgo detector in Italy observed gravitational waves produced by the last few decaying orbits (inspiral), followed by the merger of the neutron star with the black hole. Just ten days later a second gravitational-wave signal from the inspiral and merger of a neutron star with a black hole, was observed, this time by both Advanced LIGO detectors (in Livingston and also in Hanford, Washington) and the Virgo detector. This is the first time gravitational waves have been observed from a mix of neutron stars and black holes. These new discoveries are nick-named GW200105 and GW200115.

The masses of neutron stars and black holes measured through
gravitational waves and electromagnetic observations.
(Image credit: LIGO-Virgo & Frank Elavsky, Aaron Geller, Northwestern University)
(See the science summary for details.)

Summary of our knowledge of the component masses of the objects
that produced GW200105 and GW200115.
(See the science summary for details.)


Read a free preprint of the full scientific article here.


▲Back to TOP

April 21st, 2021

The 8th KAGRA international workshop (KIW) will be held on July 7-9 2021, hosted by the Korea Astronomy and Space Science Institute (KASI).


▲Back to TOP