- Start
- Nov 15, 202650% CONFIDENCEfrom the source
LIGO, Virgo and KAGRA Begin the IR1 Observing Run
- The LIGO-Virgo-KAGRA collaborations plan a six-month intermediate observing run, IR1, "beginning early- to mid-November of 2026"[1]
- Both LIGO detectors take part; Virgo joins despite possible maintenance interruptions, and KAGRA joins later as it becomes available[1]
- It precedes O5, the fifth observing run, whose plans and timeline are still in discussion and being refined with no dates published[1]
- The plan was last updated on 3 September 2026, with the next update due 15 October 2026 or sooner[1]
References 368% CONFIDENCE
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]50%observing.docs.ligo.org/planobserving.docs.ligo.org· Posted Sep 22, 2026· Starts Nov 15, 2026 ✓· 33% of score
The collaborations' own observing plan, last updated 3 September 2026, gives only a window - a six-month run "beginning early- to mid-November of 2026" - and says the next update is due 15 October 2026 or sooner. With no day named, the pin takes the close of the stated window rather than its start, so it is not early; it moves when the collaborations name the day.
- [2]80%
- [3]75%
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