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MASTER-SAAO: bright, >6mag amplitude optical transient

ATel #9046; E. Gorbovskoy, V. Lipunov (Lomonosov MSU), D. Buckley, S. Potter(SAAO), N. Tiurina, V. Kornilov, A. Kuznetsov, O. Gress, V. Vladimirov, I. Gorbunov, E. Popova, D. Kuvshinov (Lomonosov MSU, SAI), V. Shumkov, T. Pogrosheva (MASTER-Team)
on 12 May 2016; 20:46 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J052455.76-283005.8 discovery - new possible dwarf nova outburst, Ampl>6.2m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 05h 24m 55.76s -28d 30m 05.8s on 2016-05-11.69694 UT.
The OT unfiltered magnitude is 15.8m (limit 18.8m).
There are 6 images with OT. There is no minor planet at this place.
We have reference image without OT on 2015-12-16.98117 UT with unfiltered magnitude limit 21.0m.
There is no any known source in VIZIER, it means the amplitude is more then 6.2mag.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/052455.76-283005.8.png

MASTER Global Robotic Net