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8 mag amplitude OTdetected by MASTER

ATel #4446; P. Balanutsa, D. Denisenko, N. Tiurina, E. Gorbovskoy, V. Lipunov, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov (Moscow State University, SAI), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov, A. Punanova (Ural Federal University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (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 (Blagoveshchensk Educational University), P. Podvorotny, S. Shurpakov, V. Shumkov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 2 Oct 2012; 06:41 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Nova, Transient

Referred to by ATel #: 4465

MASTER OT J054317.95+093114.8 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 05h 43m 17.95s +09d 31m 14.8s on 2012-09-30.78510 UT. The OT unfiltered magnitude is 13.4m (limit 17.9m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2011-11-02.73236 UT with magnitude limit in 'V' filter 18.8m.

There is a faint star (magnitude ~21) within 1.5" from the position of the OT visible on POSS-II plates. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J0543+0931-BRIR.jpg (10'x10' FOV).

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS and GCVS catalogs and in AAVSO VSX. This area is not covered by SDSS, CSS and GALEX. Nothing is visible on the sum of 3 NEAT images of this filed taken on 2001 Sep. 23 (limiting magnitude 20.5).

The galactic latitude is 10.5 deg. Based on the amplitude of variability (more than 7 magnitudes) we suggest that MASTER OT J054317.95+093114.8 is likely a cataclysmic variable (dwarf nova or classical Nova) in outburst.

Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/054317.95093114.8.png

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