Can LIGO Detect Daylight Saving Time?

Abstract Yes, it can. Catalogs produced by networks of gravitational-wave interferometers are subject to complicated selection effects, and the gold standard remains direct measurements of the detection probability through large injection campaigns. I leverage public data products from the LIGO-Virgo-KAGRA Collaborations’ third and fourth observing runs to show that there are nontrivial temporal variations within the detection probability that are well-described by a weekly cycle. There are clear differences between weekends and weekdays, between day and night (at the sites), and even between daylight saving time and standard time. I discuss possible causes for this behavior and implications.