Observing Plans and Public Alerts
LIGO, Virgo and KAGRA Observing Run Plans
[10 December 2020 update; next update in Spring 2021]
The LIGO-Virgo-KAGRA collaborations have reviewed the readiness status of the detector improvements and A+/AdV+ modifications in preparation for O4. As of November 2020, the O4 observing run is projected not to begin before June 2022, due to both key procurement delays and COVID-related delays. A number of significant modifications to detector systems during the next six months will refine the understanding of COVID impacts on the schedule. A revised projection of the O4 start date will be given in Spring 2021, based on lessons learned.
If you have any questions, please contact the Spokespersons:
- Patrick Brady (Spokesperson, LIGO Scientific Collaboration); email@example.com
- Jo van den Brand (Spokesperson, Virgo Collaboration); firstname.lastname@example.org
- Hisaaki Shinkai (Spokesperson, KAGRA Collaboration); email@example.com
Additional information on the status of LIGO Laboratory operations in reference to COVID-19 can be found here.
Observing Plan information prior to O3 suspension
The information below contains historical documents relvant to LIGO-Virgo observing plans and public alerts. In light of the suspension of O3 operations one month earlier than planned and the ongoing COVID-19 pandemic, dates and plans discussed in these documents will likely require revision.
- The document Advanced LIGO, Advanced Virgo and KAGRA observing run plans presented prior best estimates of the plausible observing scenarios for the third (O3), fourth (O4) and fifth (O5) observing runs. This document superseded the schedule projections contained in the Living Reviews article, Prospects for observing and localizing gravitational-wave transients with Advanced LIGO, Advanced Virgo and KAGRA
- Historical information on the planned sensitivity, possible detection rates, and other details of interest can be found in the LIGO/Virgo Public Alerts User Guide and in the presentations and other documents that can be found in the Open LVEM Forum.
- The graphic below summarizes the earlier plans for O3 and the future observing runs prior to the early suspension of O3 due to COVID-19. The start and end dates of future observing runs are being reconsidered, and there remains significant uncertainty in the actual sensitivities (BNS ranges given below) that will be achieved.
O3 observing run timeline
- Start date: 1 April 2019
- Commissioning break: 1-31 October 2019
- Observing suspended: 27 March 2020
Public Alerts in O3
- Public Alerts for O3 ended on 27 March 2020.
- Alerts are issued through the GCN/TAN system.
- For more information and usage examples, see the LIGO/Virgo Public Alerts User Guide.
- The official candidate event database is GraceDB.
- For the general public, a more accessible view is maintained on the Chirp website; mobile apps are also available there.
GW170817 Localization and Triangulation Annuli. We can pinpoint sources like GW170817 much more accurately now that we can triangulate the signal between Hanford, Livingston, and Virgo. The rapid Hanford-Livingston localization is shown in blue, and the final Hanford-Livingston-Virgo localization is in green. The gray rings are one-sigma triangulation constraints from the three detector pairs. [Credit: LIGO/Virgo/NASA/Leo Singer (Milky Way image: Axel Mellinger)]