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We presented the results of MASTER Global Robotic Net participation in the program of electromagnetic support of theaLIGO (O1), LIGO/Virgo (O2, O3) gravitational-wave experiments sets. This study deals with the first set of observations O1 in September 2015/ January 2016 (Abbott et al. 2016a), the second set of observations O2 in November 2016/August 2017 of the LIGO (in Jan-Jul) and joint LIGO/VIRGO (LVC) (in Aug) collaboration (Abbott et al.2017a-c) and the third observing set (O3) from April 2019 to April 2020. The main purpose of these observations was to perform the first-time accurate localization of gravitational-waves sources in astronomical history, which successfully ended with independent discovery of a Kilonova by MASTER at GW 170817 location (Abbott et al.2017a, Lipunov et al.2017a). In numerous other observations, dozens of optical transients unrelated to gravitational waves were discovered. Nevertheless, this first gravitational-wave localization experiment in the history of astronomy is of exceptional importance for the development of future successful strategy for localizations of GW events involving relativistic stars. Furthermore, the objects discovered during the inspection of huge error boxes were studied in particular detail by the telescopes worldwide and provided important information about such objects in the Universe as supernovae, novae, active galactic nuclei, dwarf novae and other explosive phenomena in the Universe. Robotic telescopes of the MASTER Global Net inspected a total sky area more than 220000 square degrees inside 3-Sigma error-fields.We report Global MASTER Robotic Net follow up observations of the O1, O2 and O3 observing sets.