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MASTER-SAAO: dwarf nova outburst

ATel #7814; V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), V. Kornilov, P. Balanutsa, V. Chazov, A. Kuznetsov, N. Tiurina, D. Vlasenko, I. Gorbunov, E. Popova (Lomonosov Moscow State Uiversity, Sternberg Astronomical Institute), N. Budnev, S. Potter, M. Kotze (South African Astronomical Observatory), O. Gress, K. Ivanov (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University)
on 20 Jul 2015; 09:34 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J142747.09-433320.8 - new dwarf nova ouburst, Ampl>4.2m, no VIZIER source

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 14h 27m 47.09s -43d 33m 20.8s on 2015-07-18.75929 UT.
The OT unfiltered magnitude is 17.8m (limit 19.5m).
There are 3 images with this OT at this night. There is no minor planet at this place brighter 20m. We have reference images without OT on 2015-04-11.9599UT with 19.5 unfiltered magntude limit, on 2015-02-28.02557 UT with m_lim=20.0, on 2015-01-17.05186 with m_lim=19.2. There is no any sources in VIZIER database inside 9". So we can suggest the dwarf nova outburst with Ampllitude more then 4.2m.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/142747.09-433320.8.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net