MASTER-IAC: bright OT with ampltude more then 6.3mag

ATel #9766; V. Shumkov, V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Vladimirov, P. Balanutsa, D. Kuvshinov, V. Kornilov, V. Chazov (Lomonosov MSU, SAI)
on 18 Nov 2016; 09:23 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J125532.84-050442.8 discovery - new dwarf nova outburst, Ampl>6.3m, no VIZIER
MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 12h 55m 32.84s -05d 04m 42.8s on 2016-11-17.26843 UT.
The OT unfiltered magnitude is 15.7m (limit 17.5m).
The OT is seen in 3 image. There is no minor planet at this place.
We have reference images without OT on 2016-04-03.09016 UT with unfiltered magnitude limit 20.5m, on 2016-07-24 21:17:44UT with mlim=19.2. There is no OT in MASTER-Amur,-Kislovodsk,-Tunka databases since 2010-04-19 20:34:30UT up to 20m
There is no any sources in VIZIER database, it means 22m POSS history limit and more then 6.3mag of current amplitude value.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/125532.84-050442.8.png

MASTER Global Robotic Net