MASTER-Kislovodsk: bright dwarf nova outburst

ATel #7861; S. Shurpakov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU, SAI), N. Samus (INASAN, Lomonosov MSU, SAI), N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, I. Gorbunov, V. Chazov, D. Vlasenko (Lomonosov Moscow State University, Sternberg Astronomical Institute), A. Tlatov, D. Dormidontov, V. Senik, A. V. Parhomenko (Kislovodsk Solar Station of the Pulkovo Observatory), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), O. Gress, N. M. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 1 Aug 2015; 07:48 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J021211.74+475602.7 - the discovery of bright possible dwarf nova outburst (13.6m, Ampl>3m)

MASTER-Kislovodsk auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 02h 12m 11.74s +47d 56m 02.7s on 2015-07-31.92043 UT.

The OT unfiltered magnitude is 13.6m (the limit is 17.5m). There are 3 images with m_OT=13.6. There is no minor planet at this place.

We have reference images with OT in quiet state on 2009-10-12.044UT with R=16.6, on 2010-07-28.927UT with unfiltered m=16.7, on 2011-10-30.901UT with unfiltered m=16.6, on 2012-09-19.946UT with m=16.5, on 2013-11-11.802UT with m=16.6, on 2014-08-22.980UT with m=16.5 . There is USNO-B1 star with B1=17.53,R1=16.23,B2=17.96,R2=16.75,I=15.82. So we can suggest the dwarf nova outburst with Ampl>3m

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/021211.74475602.7.png

MASTER Global Robotic Net