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Optical Anti-Transient detected by MASTER-SAAO

ATel #8190; E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley, S. Potter, M. Kotze, A. Knyazev (South African Astronomical Observatory), P. Balanutsa, Chazov, V. Shumkov (M. V. Lomonosov MSU, SAI),V. Kornilov, N. Tiurina, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Chazov, E. Popova (M. V. Lomonosov MSU, SAI), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinskiy (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 19 Oct 2015; 20:54 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Binary, Cataclysmic Variable, Transient

Referred to by ATel #: 8191

MASTER OT J072703.91-631952.8 - eclipsing binary with 9 year period?

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 27m 03.91s -63d 19m 52.8s on 2015-10-19.02311 UT. The OT unfiltered magnitude is 17.4m (limit 20.5m). The OT is seen in 22 images. We have reference image without OT on 2014-12-25.01565 UT with unfiltered magnitude limit 20.4m.

Spectral observations are required.

There is the USNO-B1.0 star wqith R=~14 and B=~14.7 atr thgis place. We found the same low state ~3554 days (~9.4 years) ago in Catalina data base.There is GALEX source at this position. It means that we have very interesting system.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/072703.91-631952.8.png

This is the 4-th antitransient discovered by MASTER (see Atel #4784 , Atel #5953, Atel #7382).

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net