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Area of Science:

  • Gravitational-wave astronomy
  • Astrophysics
  • Cosmology

Background:

  • The LIGO-Virgo collaboration operates advanced gravitational-wave detectors.
  • The third observing run (O3) was a significant period for gravitational-wave detection.
  • The COVID-19 pandemic impacted scientific operations globally.

Purpose of the Study:

  • To review the performance and key findings of the LIGO-Virgo third observing run (O3).
  • To analyze the challenges and successes during the O3 run, including pandemic-related disruptions.
  • To provide an overview of the past 12 months of gravitational-wave astronomy.

Main Methods:

  • Analysis of operational data from LIGO and Virgo detectors.
  • Review of scientific alerts and published results from O3.
  • Assessment of the impact of external factors, such as the pandemic, on detector performance and data quality.

Main Results:

  • Summary of gravitational-wave events detected during O3.
  • Discussion of detector sensitivity and uptime throughout the run.
  • Evaluation of the scientific contributions and challenges faced during the O3 period.

Conclusions:

  • The O3 run, despite early termination, yielded significant scientific results.
  • The collaboration demonstrated resilience in adapting to pandemic-related operational changes.
  • Lessons learned from O3 will inform future observing runs and detector upgrades.