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MASTER: optical transients detection

ATel #9729; P. Balanutsa, T. Pogrosheva, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Rebolo, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, O. Gress, V. Shumkov, K. Ivanov, V. Vladimirov, V. Chazov, D. Vlasenko (Lomonosov Moscow State University, SAI), S. Potter (SAAO), S. Shurpakov
on 7 Nov 2016; 22:42 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J181258.26+160246.8 discovery - bright dwarf nova in outburst, Ampl>5m

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 18h 12m 58.26s +16d 02m 46.8s on 2016-11-06.81470 UT.
The OT unfiltered magnitude is 15.4m, mlim=18.0m.
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-06-08.08441 UT with unfiltered magnitude limit 18.9m. There is USNO-B1 star with B2=20.57, R2=19.14 and GALEX UV source, it meanse the ampl of current dwarf nova outburst more then 5mag (MASTER W is calibrated by USNOB1 as 0.2B+0.8R).
Spectral observations are required.
The discovery and reference images are http://master.sai.msu.ru/static/OT/181258.26160246.8.png

MASTER OT J054559.55-214305.1 discovery - possibly UVCet type flare

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 05h 45m 59.55s -21d 43m 05.1s on 2016-10-26.99762 UT.
The OT unfiltered magnitude is 17.5m, mlim=20.8.
The OT is seen in 2 image. There is no minor planet at this place, and no human satellites or their parts outside at this time.
We have reference image on 2015-12-18.03497 UT with unfiltered mlim= 20.7m, there is m_OT<~20.5 on 2016-11-02 01:14:19UT with mlim=20.5 .
There is USNO-B1 star in 3" with known R2=20.86, I=18.71, no JHK, but the time of outburst looks most likely to red dwarf flare.
Spectral observations are required.
The discovery and reference images are http://master.sai.msu.ru/static/OT/054559.55-214305.1.png

MASTER OT J114134.71-504829.3 discovery - bright dwarf nova outburst, Ampl>3.7m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 41m 34.71s -50d 48m 29.3s on 2016-11-01.07264 UT.
The OT unfiltered magnitude is 16.3m, mlim=18.8.
The OT is seen in 13 images. There is no minor planet at this place. We have reference image on 2016-04-16.05932 UT with unfiltered mlim= 19.8m.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/114134.71-504829.3.png

MASTER optical transients discoveries

MASTER Global Robotic Net