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Very Bright OT detected by MASTER

ATel #6946; P. Balanutsa, V. Lipunov, E. Gorbovskoy, N. Tiurina, D. Denisenko, A. Kuznetsov, M. Pruzhinskaya, A. Rufanov, V. Vladimirov, V. G. Kornilov (Lomonosov Moscow State University, SAI), D. Buckley, S. Potter, A. Kniazev, M. Kotze (South African Astronomical Observatory), K. Ivanov, O. Gres, 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, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University),V. Shumkov, S. Shurpakov (MASTER team members)
on 18 Jan 2015; 10:47 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, AGN, Binary, Cataclysmic Variable, Transient

MASTER OT J085854.16-274030.7 - possible CV

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 08h 58m 54.16s -27d 40m 30.7s on 2015-01-17.78086 UT (See MASTER project description: Lipunov et. al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, pp. 1-7). The OT unfiltered magnitude is 13.7m (limit 18.4m).

The OT is seen in 67 images. There is no minor planet at this place. We have reference image without OT on 2014-12-23.94582 UT with unfiltered magnitude limit 19.9m.

There is star in the USNO-A2.0 Catalogue (Monet, 1998) with B=18.6, R= 17.8 .

There is one source in Atlas of Radio/X-ray associations (ARXA) at this place inside our error box (0.7 arcsec diameter). There is one source in Second ROSAT PSPC Catalog (2 arcsec offset).

There is one bright flare in CATALINA survey but 7 arcsec offset.

Spectral observations are required.

MASTER light curve is available at http://master.sai.msu.ru/static/OT/MASTER085854.16-274030.7p.png

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/085854.16-274030.7.png

List of Optical Transients discovered by MASTER

Global MASTER Net