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Construction of the initial Virgo detector was completed in June 2003, [34] and several data collection periods ("science runs") followed between 2007 and 2011, after 4 years of commissioning. [35] [36] Some of the runs were performed with the two LIGO detectors (which are located in Hanford, Washington and in Livingston, Louisiana). [37]
Unlike GW170817, this event did not result in any light being detected. Furthermore, this is the first published event for a single-observatory detection, given that the LIGO Hanford detector was temporarily offline at the time and the event was too faint to be visible in Virgo's data. [94]
LIGO has been involved in all subsequent detections to date, with Virgo joining in August 2017. [2] Joint observation runs of LIGO and VIRGO, designated "O1, O2, etc." span many months, with months of maintenance and upgrades in-between designed to increase the instruments sensitivity and range.
GW170814 was a gravitational wave signal from two merging black holes, detected by the LIGO and Virgo observatories on 14 August 2017. [1] On 27 September 2017, the LIGO and Virgo collaborations announced the observation of the signal, the fourth confirmed event after GW150914, GW151226 and GW170104. It was the first binary black hole merger ...
LIGO is famous as the site of the first confirmed detections of gravitational waves in 2015. LIGO has two detectors: one in Livingston, Louisiana; the other at the Hanford site in Richland, Washington. Each consists of two light storage arms which are 4 km in length. These are at 90 degree angles to each other, with the light passing through 1 ...
The second generation upgrades were made during the early 2010s, lasting from 2010 to 2014 for LIGO and 2011 to 2017 for Virgo. In parallel, the KAGRA project was launched in Japan in 2010. In 2015, soon after restarting observations, the two LIGO detectors achieved the first direct observation of gravitational waves.
KAGRA is a laser interferometric gravitational wave detector. It is near the neutrino physics experiments. KAGRA detector participated in the O3 observing run of LIGO and Virgo in 2019 and 2020. [5] [6] and in O4a for a month before going back to commissioning. [7]
Time–frequency representations (Chatterji et al. 2004) of data containing GW190814, observed by LIGO Hanford (top), LIGO Livingston (middle), and Virgo (bottom). Times are shown relative to 2019 August 14, 21:10:39 UTC. Each detector's data are whitened by their respective noise amplitude spectral density and a Q-transform is calculated.