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2 dwarf nova outbursts detected by MASTER

ATel #8172; E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo Lopez, M. Serra-Ricart, G. Israelian, N. Lodieu, L. Suarez-Andres ( Instituto de Astrofisica de Canarias), V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov, D. Vlasenko, I. Gorbunov (M. V. Lomonosov Moscow State University, SAI), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), D. Buckley, S. Potter, A. Knyazev, M. Kotze (South African Astronomical Observatory), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinskiy (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 16 Oct 2015; 00:11 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J000337.27-343323.9 discovery - dwarf nova outburst, Ampl>3.2m

MASTER-IAC auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 00h 03m 37.27s -34d 33m 23.9s on 2015-10-13.98017 UT.
The OT unfiltered magnitude is 17.1m (limit 19.5m).
The OT is seen at 17 images on 2015-10-(13.98017/14.001) with m_OT=17.1 and on 2015-10-(14.982/15.007) with m_OT=17.2. There is no minor planet at this place. We have reference image without OT on 2015-09-09.09921 UT with 20.3m unfiltered magnitude limit .
There is USNO-B1 star in 0.3" with B2=20.1, R2=19.9, it has also ultraviolet part of the spectrum (Galex), so we suggest the dwarf nova outburst with amplitude more than 3.2m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/000337.27-343323.9.png

MASTER OT J203134.48+030423.4 discovery - possible dwarf nova outburst with Ampl>3.8m

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 20h 31m 34.48s +03d 04m 23.4s on 2015-10-13.83861 UT.
The OT unfiltered magnitude is 16.3m (limit 19.3m).
The OT is seen in 8 images. There is no minor planet at this place. We have reference image without OT on 2015-06-16.18352 UT with 19.7m unfiltered magnitude limit .
There is USNO B1 star with B2=20.1,R2=19.8, so we suggest the dwarf nova outburst with amplitude more than 3.8m .
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/203134.48030423.4.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net