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Optical transient inside bright galaxy NGC 474.

ATel #10570; P. Balanutsa, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Chazov, A. Kuznetsov, D. Vlasenko (Moscow State University, SAI) (Ural Federal University) K. Ivanov, O. Gress (Irkutsk State University) (Kislovodsk solar station of the Pulkovo observatory RAS) (Blagoveshchensk Educational University) (MASTER team members) (South African Astronomical Observatory) R. Rebolo, M. Serra-Ricart, G. Israelyan, N. Lodieu (Instituto de Astrofisica de Canaries)
on 11 Jul 2017; 16:28 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 01h 20m 14.45s +03d 24m 10.6s on 2017-07-11.21322 UT. The OT magnitude is 16.7m in 'I' band (image upper limit 17.8m) and is 17.3m in 'B' filter (image upper limit 18.9m)

The OT is seen in 9 images. There is no minor planet at this place. This optical transients is close to galaxy NGC 474.

We have reference image without OT on 2015-11-08.98530 UT with magnitude limit in unfiltered filter 19.8m.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/012014.45032410.6_9riMiWN.png