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MASTER: optical transients

ATel #9963; N. Kochutina, O. Gress, P. Balanutsa, V. Shumkov, T. Pogrosheva, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), A. Tlatov (KSS, Pulkovo observatory), N. Tiurina, E. Gorbovskoy, A. Kuznetsov, V. Kornilov, V. Vladimirov, D. Kuvshinov, V. Chazov, A. Krylov, I. Gorbunov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (OAFA), C. Saffe (ICATE), V. Senik, D. Dormidontov, A. Parkhomenko, Kislovodsk solar station of the Pulkovo observatory RAS), A. Gabovich, V. Yurkov (BSPU)
on 14 Jan 2017; 23:16 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Transient, Variables

MASTER OT J163946.76-614600.6 detection - possible dwarf nova outburst, Ampl>3.4m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 16h 39m 46.76s -61d 46m 00.6s on 2017-01-12.35470 UT.
The OT unfiltered magnitude is 15.3m (limit 17.1m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-10-02.03574 UT with unfiltered magnitude limit=18.7m.
There is USNO-B1 star with R1= B2! = 17.6 (previous outburst in 1980?)
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/163946.76-614600.6.png

MASTER OT J052258.93-340711.1 discovery - new OT, no VIZIER data, Ampl>4.5m

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 05h 22m 58.93s -34d 07m 11.1s on 2017-01-10.31794UT with unfiltered m_OT=18.5. The second image is on 2017-01-10.32863 UT with m_OT=17.5 (limit 19.3m).
We have only 2 images per that night. There is no minor planet at this place. The nearest in time image is on 2017-01-13 06:21:29UT with mlim=18.0 without OT.
We have reference image without OT on 2016-10-06.35672 UT with unfiltered mlim=20.6m.
There is no known sources in VIZIER database, it means 22mag POSS limit and more then 4.5mag amplitude of current outburst
Deep photometry is required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/052258.93-340711.1.png

MASTER090525.27+405055.2 optical flare detection

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 09h 05m 25.27s +40d 50m 55.2s on 2017-01-07.00743 UT.
The OT unfiltered magnitude is 19.9m (limit 20.4m).
The second image is on 2017-01-07.02318UT with m_OT = 19.0 - possible UVCet?
We have reference image without OT on 2016-10-31.99897 UT with unfiltered magnitude limit 20.1m, on 2017-01-08 19:42:47UT with mlim=19.3.
There is red star in 1.8" http://skyserver.sdss.org/dr9/en/tools/quicklook/quickobj.asp?id=1237657629514072391
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/090525.27405055.2.png

MASTER Global Robotic Net