National Press Club, 529, 14th Street Northwest, Downtown, Ward 2, Washington, District of Columbia, 20005, United States
LIGO
CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins88% CONFIDENCEOverall confidence: 88%How well the pin's source and references back up its dates.Weighted average of how firmly 3 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better10.7 years ago
Wikipedia[2] dates both the observation and the announcement: "The first direct observation of gravitational waves was made on 14 September 2015 and was announced by the LIGO[3] and Virgo collaborations on 11 February 2016." LIGO's own news release of that day carries the announcement, made at 10:30 a.m. Eastern at the National Press Club, where this pin is placed.At a press conference at the National Press Club in Washington, the LIGO and Virgo collaborations announce GW150914, a signal from the merger of two black holes recorded by both LIGO detectors on 14 September 2015 - the first direct observation of gravitational waves.