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gravitational wave

Planned IR1 start window

The interim gravitational-wave observing campaign IR1 is expected to begin between late October and mid-November 2026.

Published

Key facts

  • Status: scheduled
  • Time precision: unknown
IR1 is a planned six-month interim campaign by the gravitational-wave detector network. The IGWN public-alert guide places its start between late October and mid-November 2026. Both LIGO detectors are expected to participate; Virgo may join intermittently because of maintenance and upgrades, and KAGRA’s participation depends on availability. The dates in this record mark only the month-level possible start window, not the exact dates of the campaign.