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MASTER: very bright Dwarf Nova

ATel #7324; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov, V. Shumkov, E. Popova, S. Shurpakov (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), O. Gress, K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University)
on 31 Mar 2015; 11:57 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J061759.04-454843.6 discovery - new bright Dwarf Nova

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 06h 17m 59.04s -45d 48m 43.6s on 2015-03-30.82425 UT.
The OT unfiltered magnitude is 15.4m (limit is 19.2m). The OT is seen in 8 images.
We have reference images without OT on 2014-12-25.94965 UT with 20.1 unfiltered magnitude limit, on 2014-12-24.991 with m_lim=20.1, on 2015-02-19.981 with m_lim=19.7. The amplitude is 5.5m, so this OT can be Dwarf Novae.
There is no minor planet at this place. There is no any source inside 5" in VIZIER database, NSVS and CRTS surveys.

The discovery and reference images are available at:http://master.sai.msu.ru/static/OT/061759.04-454843.6.png

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net