TITLE: GCN CIRCULAR NUMBER: 15712 SUBJECT: GRB 140105A: MASTER-Net early optical observations and time correction DATE: 14/01/09 17:35:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V. Lipunov, D.Denisenko, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov Lomonosov Moscow State University, Sternberg Astronomical Institute A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER VWF robotic very wide field cameras (FOV=2x384 square degrees, D=72mm, f/1.2, 1 pix = 22 arcsec, http://observ.pereplet.ru) installed on MASTER-II robotic telescope syncronously covered ~15% part of 3 sigma FERMI-GBM error box (Xiong et al., GCN 15688). No credible transients have been found on our images. The 3 sigma unfiltered upper limit is 10.6. MASTER-II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB140105A 21 sec after notice time and 45 sec after trigger time at 2014-01-05 01:33:46 UT. After pointing by FERMI alert we cover 90% of 1-sigma and 70% of 3-sigma FERMI-GBM error box. We didn't find new object in error box on single and coadd images. The 3 sigma upper limit on single 5 seconds exposure image is 10.6 and 12.0 on coadd of 24 images with total exposure 120 seconds. The positions of all iPTF optical afterglow candidates (Singer et al., GCN 15686) are covered by out cameras since 48 sec. after the trigger but there are no flares up to 10.6 mag. on their place. The movie is available here http://master.sai.msu.ru/static/GRB/GRB140105A/GRB140105A.gif The map of error box and our FOV is available at http://master.sai.msu.ru/static/GRB/GRB140105A/GRB140105A_map.png The pointing time informations in our previous telegram Gorbovskoy et al. GCN 15692 are not correct. We apologize for this inaccuracy. The message may be cited.