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MASTER-SAAO and MATER-Net OTs detection

ATel #8758; P. Balanutsa, V. Shumkov, V. M.Lipunov (Lomonosov MSU), D. A. H. Buckley(SAAO), E. Gorbovskoy, N. Tiurina, S. Shurpakov, O. Gress, A. Kuznetsov, V. Vladimirov, V. Kornilov, D. Vlasenko, I. Gorbunov(Lomonosov MSU, SAI), A. Kniazev, S. B. Potter, M. Kotze (SAAO), A. Tlatov, V. Senik, D. Dormidontov (Kislovodk Solar station, Pulkovo observatory)
on 1 Mar 2016; 09:10 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J072858.62-652131.9 discovery - dwarf nova outburst with ampl>3m

MASTER-SAAO auto-detection system (Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 07h 28m 58.62s -65d 21m 31.9s on 2016-02-28.87676 UT with unfiltered m_OT=19.0m (the limit is 20.3m). OT's photometry is :
2016-02-28 21:02:32.516UT m_OT=19.0
2016-02-28 21:13:36.672UT m_OT=18.9
2016-02-28 21:27:15.451UT m_OT=18.2

The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2015-11-13.99376 UT with unfiltered magnitude limit 20.7m.
There is GSC2.3.2 star with known blue m=21.4, so we suggest >3m outburt's amplitude.
Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/072858.62-652131.9.png

MASTER OT J200622.89+031935.3 discovery - dwarf nova outburst,ampl>3m

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 06m 22.89s +03d 19m 35.3s on 2016-03-01.09531 UT.
The OT unfiltered magnitude is 16.1m (the limit is 17.7m)
This OT is seen in 3 images. There is no minor planet at this place.
We have reference images without OT
on 2015-07-16 14:14:24UT with m_lim=18.0,
on 2014-07-21.96896 UT with 19.2 unfiltered magnitude limit,
on 2013-06-06 18:12:19 UT mith m_lim=18.6,
on 2012-06-21 21:53:24 with m_lim=19.4,
on 2010-09-24 17:56:57UT with m_lim=18.3.

There is GC2.3.2,GALEX star at this place with known blue B=17.2+-0.4(previous outburst in 1990)

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/200622.89031935.3.png

MASTER Global Robotic Net