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MASTER-Kislovodsk: bright high amplitude OT

ATel #8725; P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, O. Gress, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Vladimirov (Lomonosov Moscow State University, SAI), A. Tlatov, V. Senik, D. Dormidontov, A. Parkhomenko (Kislovodsk Solar Station, Pulkovo observatory)
on 24 Feb 2016; 12:30 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

Referred to by ATel #: 8731

MASTER OT J084140.94+722732.6 discovery - high amplitude dwarf nova outburst(ampl>5.5m) with MASTER archive 6.6mag outburst in 2013y

MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 08h 41m 40.94s +72d 27m 32.6s on 2016-02-22.89248 UT.
The OT unfiltered magnitude is 14.7m. The OT is seen in 3 images. There is no minor planet at this place.
We have reference image on 2013-12-30.89828 UT with unfiltered magnitude limit 19.5m, m_OT~19.7.
We have archive previous outburst in MASTER-Tunka database on 2013-04-25 19:01:50UT with m_OT=13.1.
There is USNO-B1 star with B2=18.70,R2=18.73, I=18.72, so we suggest the dwarf nova outburst with Amplitude more then 5m on 22nd of Feb2016 and Ampl>6.6m in last outburst(2013).
Spectral observations are required.
The discovery and referencei mages are available at http://master.sai.msu.ru/static/OT/MASTER084140.94+722732.6.jpg

MASTER Global Robotic Net