Аннотация:MASTER-Tavrida auto-detection system discovered OT source at (RA, Dec) = 00h 42m 59.00s +41d 26m 26.9s on 2017-09-09.93448 UT. The OT unfiltered magnitude is 18.3m (limit 19.1m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2017-08-28.01847 UT with unfiltered magnitude limit 19.5m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/004259.00412626.9.png