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MASTER: bright dwarf nova outburst

ATel #9346; V. Shumkov, O. Gress, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tyurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, D. Kuvshinov, E. Popova, D. Vlasenko, T/Pogrosheva (Lomonosov Moscow State University, SAI)
on 9 Aug 2016; 00:01 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J195239.94+514156.4 discovery - new dwarf nova outburst, no known VIZIER data, ampl>6m
MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 19h 52m 39.94s +51d 41m 56.4s on 2016-08-06.96659 UT.
The OT unfiltered magnitude is 16.9m (limit 19.4m). The OT is seen in 2 images in MASTER-IAC, and on 4 images in MASTER-Kislovodsk with m_OT=16.0 on 2016-08-02 21:49:18/21:37:57UT.
We have reference image without OT on 2016-05-07.15047 UT with unfiltered magnitude limit 20.1m.
There is no any known sources inside 5" in VIZIER database, it means the 22m POSS limits and current outburst with ampl>6m Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/195239.94514156.4.png

MASTER OT J213810.25+254454.2 discovery - possibly dwarf nova outburst, ampl>3.8m

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 21h 38m 10.25s +25d 44m 54.2s on 2016-08-08.00823 UT.
The OT unfiltered magnitude is 18.2m (limit 19.8m).
The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-07-12.04402 UT with unfiltered magnitude limit 19.4m.
There is only Sloan star with red r=21.542 (and POASS 22m limit in history), it means the current outburst;s ampl>3.8m
Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/213810.25254454.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net