Аннотация:https://gcn.gsfc.nasa.gov/gcn3/27917.gcn3MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the GRB200612.19 19 sec after notice time and 495 sec after trigger time at 2020-06-12 04:47:52 UT. On our 4-th (180s exposure) set , obtained 960 sec after tigger time at 2020-06-12 04:55:38 UT, we found 1 optical transient within Swift error-box (ra=302.679 dec=-45.3569 r=0.05) brighter than 18.2. T-Tmid Date Time Expt. Ra Dec Mag---------|---------------------|-------|-----------------|-----------------|------- 1050 2020-06-12 04:55:38 180 (20h 10m 48.64s , -45d 20m 06.7s) 17.9The 5-sigma upper limit has been about 18.2magThe message may be cited.