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MASTER: 2 new OT

ATel #10008; V. Shumkov, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), N. Tiurina, E. Gorbovskoy, A. Kuznetsov, P. Balanutsa, V. Kornilov, O. Gress, V. Vladimirov, D. Kuvshinov (Lomonosov MSU), A. Tlatov, V. Senik, D. Dormidontov (KSS), A. Gabovich (BSPU), T. Pogrosheva
on 26 Jan 2017; 08:24 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J185824.93-694451.3 discovery - new OT(no VIZIER sources), dwarf nova? Ampl>4m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 18h 58m 24.93s -69d 44m 51.3s on 2017-01-25.02720 UT.
The OT unfiltered magnitude is 18.0m (mlim=19.0).
The OT is seen in 6 images. There is no minor planet at this place.
We have reference image on 2016-05-02.98875 UT with unfiltered mlim= 20.4m.
There is no any known source in VIZIER database, it means more then 4mag of current outburst amplitude (22m POSS limit).
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/185824.93-694451.3.png

MASTER OT J170828.90-753448.3 discovery - new OT(no VIZIER sources), dwarf nova? Ampl>3.5m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 17h 08m 28.90s -75d 34m 48.3s on 2017-01-25.01446 UT.
The OT unfiltered magnitude is 18.5m (mlim=19.8).

The OT is seen in 6 images. There is no minor planet at this place.
We have reference images on 2014-12-19.04841 UT with unfiltered mlim=20.0m, on2016-09-19 18:11:44 with m_limit = 19.3 .
There is no any known source in VIZIER database, it means more then 3.5mag of current outburst amplitude (22m POSS limit).

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/170828.90-753448.3.png

MASTER Global Robotic Net