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MASTER: high amplitude (>6.8m) optical transient and new OT

ATel #10037; O. Gress (API ISU), T. Pogrosheva, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, V. Chazov, V. Vladimirov, V. Shumkov, D. Kuvshinov (Lomonosov MSU), K. Ivanov, N. Budnev (API, Irkutsk State University), A. Tlatov, V. Senik (Kislovodsk solar station of the RAS Pulkovo observatory)
on 2 Feb 2017; 00:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J191248.12+374934.6 discovery - high amplitude (>6.8mag) OT outburst

MASTER-Tunka auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 19h 12m 48.12s +37d 49m 34.6s on 2017-01-31.86338 UT.
The OT unfiltered magnitude is 16.1m (limit 18.4m).
The OT is seen in 7 images. There is no minor planet at this place.
There is only Sloan star in 1.2" with known red=22.894, i=22.976 , that let us suggest dwarf nova outburst with Ampl>6.8m
We have reference image without OT on 2011-08-04.61117 UT with unfiltered magnitude limit 19.2m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/191248.12374934.6_1.png

MASTER OT J141648.38+660807.3 discovery - new OT, prelimin. dwarf nova outburst, Ampl>2.5
MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 14h 16m 48.38s +66d 08m 07.3s on 2017-01-26.12647 UT.
The OT unfiltered magnitude is 19.5m (limit 19.9m).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image without OT on 2016-04-10.14612 UT with unfiltered magnitude limit 20.5m.
There is no known sources in VIZIER database, it means 22m POSS limit and more then 2.5 mag of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/141648.38660807.3.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net