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Stella, L. Tomasella, M. Branchesi, M. Capaccioli, M. Dadina, M. Lisi, M. Mapelli, M. Radovich, M. Razzano, M. Spera, N. Masetti, P. D'Avanzo, P. Marrese, P. Schipani, R. Salvaterra, S. Ascenzi, S. Benetti, S. Campana, S. Covino, S. Marinoni, S. Piranomonte, S. Yang, V. D'Elia, V. Testa","submitted_at":"2017-10-16T06:00:21Z","abstract_excerpt":"We report the results of deep optical follow-up surveys of the first two gravitational-wave sources, GW150914 and GW151226, done by the GRAvitational Wave Inaf TeAm Collaboration (GRAWITA). The VLT Survey Telescope (VST) responded promptly to the gravitational-wave alerts sent by the LIGO and Virgo Collaborations, monitoring a region of $90$ deg$^2$ and $72$ deg$^2$ for GW150914 and GW151226, respectively, and repeated the observations over nearly two months. Both surveys reached an average limiting magnitude of about 21 in the $r-$band. 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