LIGO Document P1900245-v7

Characterization of systematic error in Advanced LIGO calibration

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The raw outputs of the detectors within the Advanced Laser Interferometer Gravitational-Wave Observatory need to be calibrated in order to produce the estimate of the dimensionless strain used for astrophysical analyses. The two detectors have been upgraded since the second observing run and finished the year-long third observing run. Understanding, accounting, and/or compensating for the complex-valued response of each part of the upgraded detectors improves the overall accuracy of the estimated detector response to gravitational waves. We describe improved understanding and methods used to quantify the response of each detector, with a dedicated effort to define all places where systematic error plays a role. We use the detectors as they stand in the first half (six months) of the third observing run to demonstrate how each identified systematic error impacts the estimated strain and constrain the statistical uncertainty therein. For this time period, we estimate the upper limit on systematic error and associated uncertainty to be 7% in magnitude and 4 deg in phase (68% confidence interval) in the most sensitive frequency band 20-2000 Hz. The systematic error alone is estimated at levels of 2% in magnitude and 2 deg in phase.

Submitted to Classical and Quantum Gravity on May 05 2020.
Re-submitted to Classical and Quantum Gravity on July 29 2020.
Accepted to Classical and Quantum Gravity on Aug 21 2020.
Published on Oct 19 2020.
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arXiv version:

Sun, Ling, et al. "Characterization of systematic error in Advanced LIGO calibration." Classical and Quantum Gravity 37.22 (2020): 225008.

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Published in Class Quant Grav vol. 37 pg. 225008.
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DOI: 10.1088/1361-6382/abb14e

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