
MASTER (Mobile Astronomical System of Telescope-Robots) is an international network of Russian fully robotic telescopes.
The telescopes are located in five Russian sites, in South Africa, Argentina, Mexica and the Canary Islands. The system is intended to react quickly to reports of transient astronomical events. It started its development in 2002 under the supervision of Vladimir Lipunov and has been in fully autonomous operations since 2011.[citation needed]
On 17 August 2017, an autonomous MASTER telescope in Argentina successfully recorded a collision of neutron stars some 130 million light-years away (see GW170817 for details).

Master is designed to search for optical transients. These include:
Comet MASTER may refer to any of the five comets discovered by the survey: