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MASTER-SAAO: Anti-Nova discovery

ATel #7382; D. Denisenko, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, P. Balanutsa, N. Tiurina, V. Kornilov, V. Chazov, V. Vladimirov, E. Popova, S. Shumkov, S. Shurpakov (Lomonosov Moscow State University, SAI), 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. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovich (BSPU)
on 13 Apr 2015; 16:59 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

Referred to by ATel #: 8190

MASTER OT J123253.56-511846.1 - Fading star, Anti-Nova transient

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 12h 32m 53.56s -51d 18m 46.1s on 2015-04-08.980UT.

There are 6 images with this OT in MASTER-SAAO database with m_OT=18.0m (the limit is 19.0m).

MASTER-SAAO preliminary photometry of this MASTER OT during 2015 is the following:
on 2015-03-15.027UT with m_OT=19.2, on 2015-02-10.032UT with m_OT=19.2, on 2015-01-03.026UT with m_OT=19.2

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/123253.56-511846.1.png

This OT is identical to 0386-0308677 USNO-B1 star with B2=15.90 R2=15.71 I=16.88.

So MASTER OT J123253.56-511846.1 is likely a new cataclysmic variable of VY Scl type (anti-nova) during the fading episode.

Follow up photometric and spectroscopic observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net