Аннотация:MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 18h 50m 11.29s +30d 20m 59.5s on 2013-03-19.77620 UT. The OT unfiltered magnitude is 16.9m (limit 18.2m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2013-02-24.85995 UT with unfiltered magnitude limit 18.0m.