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gravitational wave

IR1: upcoming gravitational-wave observing run

A planned six-month observing run that LIGO, Virgo, and KAGRA expect to begin around November 2026.

Published

Key facts

  • Status: scheduled
  • Time precision: unknown
IR1 (Intermediate Run 1) is a planned data-taking campaign by the LIGO, Virgo, and KAGRA gravitational-wave detectors. Available plans describe it as a six-month run beginning sometime from late October to mid-November 2026; other sources specify early to mid-November. It is not an individual gravitational-wave detection or a celestial event with its own sky position.