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MASTER: 2 dwarf nova current and previous outbursts

ATel #8125; P. Balanutsa, V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Tiurina, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Chazov, E. Popova, V. Shumkov (M. V. Lomonosov MSU, SAI), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), 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 5 Oct 2015; 22:43 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J010925.88+521021.3 discovery - possible dwarf nova outburst with current Ampl>3.3m

MASTER-Kislovodsk auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 01h 09m 25.88s +52d 10m 21.3s on 2015-10-05.82508 UT.
The OT unfiltered magnitude is 17.9m (limit 19.7m).
This OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2013-11-11.68711 UT with unfiltered magnitude limit 19.2m.
There is previous outburst of OT on 2010-11-05 17:25:34.421 with m_OT=17.4 in MASTER-Kislovodsk database. There is USNO star with B2=21.26, so we can suggest the dwarf nova outburst with current amplitude more then 3.3m ad historical outburst in 2010 with ampl mre then 3.8m.
Spectral observations are required.
The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ010925.88+521021.3.png

MASTER OT J012953.79+515231.3 discovery - new dwarf nova outburst, Ampl>4.7m
MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 01h 29m 53.79s +51d 52m 31.3s on 2015-10-05.82508 UT.
The OT unfiltered magnitude is 17.3m (limit 19.9m).
This OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2010-11-06.73095 UT with unfiltered magnitude limit 20.0m.
We have 2 images with previous outburst on 2012-09-19 20:30:50.195UT with unfiltered m_OT=17.1m in MASTER-Kislovodsk database. There is no any source inside 5" in VIZIER database (22m at POSS images), so we can suggest the dwarf nova outburst with ampl more then 4.7m.
Spectral observations are required.
http://observ.pereplet.ru/images/MASTEROTJ012953.79+515231.3.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net