GCN Circular 20492
S.Karpov, G.Beskin (SAO RAS and Kazan Federal University, Russia), S.Bondar, E.Ivanov, E.Katkova, A.Perkov (OJS RPC PSI, Russia), A.Biryukov (SAI MSU and Kazan Federal University, Russia), V.Sasyuk (Kazan Federal University, Russia) We observed the sky area corresponding to 49% probability of initial LIB skymap for the advanced LIGO trigger G270580 with Mini-MegaTORTORA nine-channel wide-field monitoring system (located at Special Astrophysical Observatory near Russian 6-m telescope) between 2017-01-20 15:05:45 UT (2.6 hours since trigger) and 2017-01-20 19:31:28 UT (7.0 hours since trigger) under varying weather condition. Observations consisted of several pointings with 10 x 60 s unfiltered exposures each in every channel, covering roughly 900 square degrees simultaneously. Image of the total sky coverage is available at http://mmt.favor2.info/scheduler/1436/lvc The footprints of acquired images are uploaded to GraceDB. Quick-look analysis did not reveal any transient brighter than V~13.5 magnitude in the data.