The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
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.
Gives the observation and announcement dates, the naming of GW150914 after the date of observation, the masses involved (36 and 29 solar masses merging to a 62 solar mass remnant) and that it was also the first observation of a binary black hole merger.[1]
The collaboration's own detection page for this event, the primary record of what was measured.[1]
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