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MASTER-Tunka: bright dwarf nova outburst

ATel #8373; O. Gress (ISU), V. Lipunov, E. Gorbovskoy (Lomonosov MSU), N. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, I. Gorbunov, D. Vlasenko, V. Vladimirov (M. V. Lomonosov Moscow State University, SAI)
on 6 Dec 2015; 09:10 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J070458.41+134816.4 discovery - possible dwarf nova outburst with amplitude more then 4.6m

MASTER-Tunka auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 07h 04m 58.41s +13d 48m 16.4s on 2015-12-05.85391 UT.
The OT unfiltered magnitude is 14.9m (the limit is 17.9m).
The OT is seen in 3 images (20h29min-21h30min) with the same magnitude. There is no minor planet at this place. We have reference image without OT on 2011-03-02.60616 UT with unfiltered magnitude limit 19.4m.

There is USNO B1 star with B1,2=20.0, R2=19.4 and Sloan i=19.17

So we suggest the dwarf nova outburst with amplitude more then 4.6m.

Spectral observations are required.

The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ070458.41134816.4.jpg

MASTER Global Robotic Net