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An important goal for LIGO (the Laser Interferometer Gravitational-WaveObservatory) and Virgo is to find periodic sources of gravitational waves. TheLIGO and Virgo detectors are sensitive to a variety of noise ofnon-astrophysical origin, such as instrumental artifacts and environmentaldisturbances. These artifacts make it difficult to know when a signal is due toa gravitational wave or noise. A continuous wave search algorithm, Fscan, andthe calculation of the coherence between the gravitational wave channels andauxiliary channels has been developed to identify the source of noise lines.The programs analyze data from the gravitational wave channels as well asenvironmental sensors, searching for significant lines that appear incoincidence (using various thresholds and frequency windows) in thegravitational wave channel as well the environmental monitors. By this method,the source of powerful signals at specific frequencies in the gravitationalwave channel caused by noise can be determined. Examples from LIGO's sixthscience run, S6, and Virgo' second scientific run, VSR2, are presented.

Noise Line Identification in LIGO S6 and Virgo VSR2