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Three bright OTs detected by MASTER

ATel #6888; O. Gress (Irkutsk), S. Shurpakov, (SAI), Rufanov, V. (SAI), D. Buckley (SAAO, South African Astronomical Observatory), V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov, D. Denisenko, V. Vladimiov (Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (SAAO), K. Ivanov, S. Yazev, N. Budnev, V. Poleshchuk, E. Konstantinov (Irkutsk State University) A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS) V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, V. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Shumkov (MASTER team members)
on 9 Jan 2015; 09:05 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J150316.62-421827.5 - CV?

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 15h 03m 16.62s -42d 18m 27.5s on 2015-01-08.07747 UT. The OT unfiltered magnitude is 16.3m (limit 18.9m). The OT is seen in 3 images. There is no minor planet at this place.

We have reference image without OT on 2015-01-01.09128 UT with unfiltered magnitude limit 19.2m.

Follow up observations are required.

MASTER OT J150316.62-421827.5 - New CV

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 15h 03m 16.62s -42d 18m 27.5s on 2015-01-08.07747 UT. The OT unfiltered magnitude is 16.3m (limit 18.9m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-01-01.09128 UT with unfiltered magnitude limit 19.2m.

There are no known object at this place brighter then 21.0 .

Spectral observations are required.

MASTER OT J182948.42+554255.9 - CV?

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 18h 29m 48.42s +55d 42m 55.9s on 2015-01-08.94564 UT. The OT unfiltered magnitude is 16.8m (limit 18.4m). The OT is seen in 7 images. There is no minor planet at this place.

We have reference image without OT on 2011-10-01.53238 UT with unfiltered magnitude limit 19.9m.

There is GALEX-DR5 and AllWISE object with 3 arcsec offset.

Spectral observations are required.

List of Optical Transients discovered by MASTER

Global MASTER Net