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MASTER-SAAO: bright dwarf nova outburst (ampl>5.2m)

ATel #8843; E. Popova, V. Lipunov (Lomonosov MSU), D. Buckley, S. Potter, A. Kniazev (South African Astonomical Observatory), E. Gorbovskoy, N. Tiurina, P. Balanutsa, O. Gress, V. Kornilov, A. Kuznetsov, V. Vladimirov, D. Vlasenko, I. Gorbunov, V. Shumkov, D. Kuvshinov (Lomonosov Moscow State University, SAI)
on 19 Mar 2016; 06:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J151126.74-400751.9 discovery - bright (14m) dwarf nova outburst, ampl>5.2

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 15h 11m 26.74s -40d 07m 51.9s on 2016-03-18.05975 UT.
The OT unfiltered magnitude is 14.0m (the limit is 19.8m).
The OT is seen in 11 images. There is no minor planet at this place.
We have reference image with m_OT=19.2 on 2015-03-30 23:40:01.902, m_OT=18.8 on 2015-04-26.06633 UT( with unfiltered magnitude limit 19.5m).So we suggest the amplitude of outbursts is more then 5.2
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/151126.74-400751.9.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net