Resumption of LIGO-Virgo-KAGRA Observing Run O4

The LIGO-Virgo-KAGRA (LVK) collaboration resumed its fourth observing run (O4) at 15:00 UTC on June 11, 2025 (00:00 JST on June 12, 2025). KAGRA has also restarted its observing run in coordination with this resumption.