MASTER-SAAO and MASTER-Tunka transients discovery

ATel #7011; S. Shurpakov, V. Vladimirov, V. Lipunov, E. Gorbovskoy, D. Buckley, P. Balanutsa, N. Tiurina, D. Denisenko, A. Kuznetsov, V. G. Kornilov (Lomonosov Moscow State University, SAI), D. Buckley, A. Kniazev, M. Kotze (South African Astronomical Observatory), K. Ivanov, O. Gress, S. Yazev, N. Budnev, V. Poleshchuk, E. Konstantinov (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk solar station of the Pulkovo observatory RAS) , V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Shumkov (MASTER team members)
on 31 Jan 2015; 06:35 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J050828.30-775951.0 : possible new CV

MASTER-SAAO auto-detection system discovered OT source with (RA, Dec) = 05h 08m 28.30s -77d 59m 51.0 at 2015-01-30.956 UT (See MASTER project description: Lipunov et. al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, p1-7).

The OT unfiltered magnitude is 17.6m (limit is 19.0m). The OT is seen at 6 images. There is no minor planet at this place. There is a star in the USNO-B1.0 Catalogue (Monet+, 2003) with B2=19.8, R2=20.44. We have reference image without OT on 2015-01-10.931 UT with 19.4m unfiltered magnitude limit 19.4m. The discovery and reference images are available at http://master.sai.msu.ru/static/OT/050828.30-775951.0.jpg . Spectral observations are required.

MASTER OT J184617.64 +173052.3 : possible new CV MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 18h 46m 17.64s +17d 30m 52.3s on 2015-01-27.984 UT.

The OT unfiltered magnitude is 17.5m (limit is 17.9m). We have 6 images with OT. There is no minor planet at this place and nothing is in 7” around at VIZIER catalogs.

We have reference image without OT on 2010-09-06.55568 UT with 18.9m unfiltered magnitude limit. The discovery and reference images are available at http://master.sai.msu.ru/static/OT/master184617.64+173052.3.jpg .

Follow up multiwavelength observations and spectroscopy are required.

MASTER J183120.63+301935.2 : ATel 4761 is active now.