Green Bank Telescope: Overview and analysis of metrology systems and pointing performance E. White, F. D. Ghigo, R. M. Prestage, D. T. Frayer, R. J. Maddalena, P. T. Wallace, J. J. Brandt, D. Egan, J. D. Nelson and J. Ray A&A, 659 (2022) A113 Published online: 15 March 2022 DOI: 10.1051/0004-6361/202141936