LIGO Document T2500212-v2

O4ab lines and combs in found in self-gated C00 cleaned data

Document #:
LIGO-T2500212-v2
Document type:
T - Technical notes
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Abstract:
Lists of vetted lines and combs for H1 and L1 during the O4ab epoch.

Run-averaged, noise-weighted spectra were generated using 7200-s-long FFTs (Hann-windowing, 50% overlap) from observing quality self-gated C00 CLEAN data minus CAT1 vetoes. Spectra data was inspected visually for artifacts and correlated with known non-astrophysical features. These lists may be periodically revised as additional understanding and insights are gained. Since the spectra are high-resolution and many averages are used to create the O4ab run-average spectra, many more features are visible than would be when analyzing spectra made using short FFT duration and few averages. The high resolution allows to see many artifacts in different frequency bins as well as revealing weak features that need many averages to stick out of the background.

These lists contain only a subset of spectral artifacts present in the data; other unidentified features are also present, but have not yet been verified to be non-astrophysical.

Note that the files from the lines repository with git tags appended to their filenames. For example, git tag O4ab_lines_v1 corresponds to files with the appendix _v1 in their filename.

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Notes and Changes:
Modified and updated the near 9.5 Hz comb in L1 data

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