  The Gravitational-wave Optical Transient Observer (GOTO) is a wide-field
telescope project focused on detecting optical counterparts to
gravitational-wave sources. GOTO uses arrays of 40 cm unit telescopes (UTs) on
a shared robotic mount, which scales to provide large fields of view in a
cost-effective manner. A complete GOTO mount uses 8 unit telescopes to give an
overall field of view of 40 square degrees, and can reach a depth of 20th
magnitude in three minutes. The GOTO-4 prototype was inaugurated with 4 unit
telescopes in 2017 on La Palma, and was upgraded to a full 8-telescope array in
2020. A second 8-UT mount will be installed on La Palma in early 2021, and
another GOTO node with two more mount systems is planned for a southern site in
Australia. When complete, each mount will be networked to form a robotic,
dual-hemisphere observatory, which will survey the entire visible sky every few
nights and enable rapid follow-up detections of transient sources.
