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MASTER-SAAO, MASTER-Tunka : dwarf novae outbursts

ATel #8346; O. Gress, V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Shumkov, I. Gorbunov, D. Vlasenko, E. Popova (M. V. Lomonosov Moscow State University, SAI), S. Potter, M. Kotze (South African Astronomical Observatory), N. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University)
on 30 Nov 2015; 17:47 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J124124.38-460208.1 discovery - possible dwarf nova outburst with Ampl>5m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 12h 41m 24.38s -46d 02m 08.1s on 2015-11-30.04874 UT.
The OT unfiltered magnitude is 17.2m (the limit is 18.3m).
The OT is seen in 8 images. There is no minor planet at this place. We have reference image without OT on 2015-02-16.05883 UT with unfiltered magnitude limit 19.9m.
There is GSC 2.3.2 star with blue 22.3, so we suggest the dwarf nova outburst with amplitude more then 5m.

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/124124.38-460208.1.png

MASTER OT J185852.54+231353.5 discovery - dwarf nova outburst with Ampl>3.3m

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 18h 58m 52.54s +23d 13m 53.5s on 2015-11-29.47635 UT. The OT unfiltered magnitude is 16.0m (limit 17.8m).
The OT is seen in 12 images. There is no minor planet at this place. We have reference image with m_OT=19.3 on 2014-06-04.75610 UT .

There is GALEX ultraviolet from this USNO-B1 star, it means the accretion to white dwarf in the case of Galactic nature, i.e. dwarf nova outburst with Amplitude more then 3.3m.

Spectral observations are required.

The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ185852.54+231353.5.jpg

MASTER auto-detection system detected current outburst of CSS 120518:201307-365620 with unfiltered m_OT=18.1 (MASTER-SAAO)

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net