Measuring the speed of gravitational waves from the first and second observing run of Advanced LIGO and Advanced Virgo

@article{Liu2020MeasuringTS,
  title={Measuring the speed of gravitational waves from the first and second observing run of Advanced LIGO and Advanced Virgo},
  author={Xiaoshu Liu and Vincent Yaofeng He and Timothy M. Mikulski and Daria Palenova and Claire E. Williams and Jolien D. E. Creighton and Jay D. Tasson},
  journal={Physical Review D},
  year={2020},
  volume={102},
  pages={024028}
}
The speed of gravitational waves for a single observation can be measured by the time delay among gravitational-wave detectors with Bayesian inference. Then multiple measurements can be combined to produce a more accurate result. From the near simultaneous detection of gravitational waves and gamma rays originating from GW170817/GRB 170817A, the speed of gravitational wave signal was found to be the same as the the speed of the gamma rays to approximately one part in $10^{15}$. Here we present… 
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