Sengupta, Anand S.Anand S.Sengupta2025-08-222025-08-222014-10-012331-8422http://arxiv.org/abs/1410.7764http://repository.iitgn.ac.in/handle/IITG2025/18135In 2009-2010, the Laser Interferometer Gravitational-wave Observa- tory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitational waves of astrophysical origin. The sensitiv- ity of these detectors was limited by a combination of noise sources inherent to the instrumental design and its environment, often localized in time or frequency, that couple into the gravitational-wave readout. Here we review the performance of the LIGO instruments during this epoch, the work done to characterize the de- tectors and their data, and the effect that transient and continuous noise artefacts have on the sensitivity of LIGO to a variety of astrophysical sources.en-USGeneral RelativityQuantum CosmologyInstrumentationMethods for Astrophysicse-Printe-Print123456789/615