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The 50th MASTER-SAAO OT.

ATel #7304; V. Shumkov, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), O. Gress, K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (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), S. Shurpakov (MASTER-team)
on 28 Mar 2015; 05:23 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER-SAAO started at the end of December 2014. For a 3 monthes we discovered 50 optical transients: 6 PSN, 21 Dwarf Novae, 18 CV, 3 variables, 1 mira-type, 1 high proper motion star.

MASTER OT J192024.77-512215.1 discovery - new Dwarf Nova or possible SN

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 19h 20m 24.77s -51d 22m 15.1s on 2015-03-22.06501 UT.

The OT unfiltered magnitude is 18.1m (the limit is 19.9m). There are 6 images with OT.
There is no minor planet at this place.
We have reference image without OT on 2015-02-15.11241 UT with 19.2 unfiltered magnitude limit.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/192024.77-512215.1.png

There are 2 GSC2.3.2 stars near this coordinates with jmag(blue)>22. But MASTER OT is between them. So this flare can be both possible SN and DN.

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net