GCN Circular 12411
A. Pozanenko (IKI), A. Volnova (SAI MSU), M. Andreev (Terskol Branch of Institute of Astronomy), V. Rumyantsev (CrAO), D. Shakhovskoy (CrAO), V. Biryukov (SAI MSU & CrAO), A. Sergeev (Terskol Branch of Institute of Astronomy) on behalf of larger GRB follow up collaboration report: We started a monitoring campaign of MAXI J1836-194 (Negoro et al., ATel 3611) after Swift triggers #502415 (=GRB110905A, Pagani et al., GCN 12327). Till now observations were obtained with Zeiss-600 (Mt. Terskol), AZT-11 (CrAO), Zeiss-600 and ZTE (SAI MSU) in the R and B filters. We clearly detect significant optical variability of the source of MAXI J1836-194, and at least one peak of our light curve (Sep. 19.80) coincides with a peak of radio light curve of MAXIJ1836-194 at 4.8 GHz (Trushkin et al., ATel. 3656). The light curve (Sep. 5 - Sep. 26) can be found at http://grb.rssi.ru/GRB110905A=MAXI_J1836-194/MAXIJ1836-194_lc_opt.png Observations will be continued.