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MASTER-Tunka: dwarf nova outburst

ATel #7892; O. Gress(ISU), V. Lipunov, E. Gorbovskoy, V. Kornilov, P. Balanutsa, N. Tiurina, A. Kuznetsov, V. Chazov, D. Vlasenko, I. Gorbunov, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), N. M.Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory),R. Rebolo, M. Serra-Ricart , N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 8 Aug 2015; 05:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT J021038.91+533751.8 detection - dwarf nova outburst, ampl>2m

MASTER-Tunka auto-detection system( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 02h 10m 38.91s +53d 37m 51.8s on 2015-08-06.63118 UT.

The OT unfiltered magnitude is 18.2m (the limit is 18.6m).

The OT is seen in 4 images. There is no minor planet at this place. We have reference images without OT on 2014-02-08.7297 with unfiltered m_lim=18.8, 2013-11-01.77271 UT with m_lim=19.0m, on 2013-10-31.7298UT with m_lim=19.0.
There are previous outbursts on 2010-08-23.634 with m_OT=17.7 (MASTER-Tunka), and on 2013-11-10.642 with m_OT=17.2(MASTER-Kislovodsk). There is USNO-B1 star with B1=20.33. So we can suggest the dwarf nova outburst with amplitude more then 2m.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTEROTJ021038.91533751.8.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net