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New bright CV with outburst amplitude 7m detected by MASTER

ATel #4515; P. Balanutsa, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov, V. Echeistov, (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), V. Shumkov, S. Shurpakov, P. Podvorotny, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 24 Oct 2012; 06:57 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable

MASTER OT J203749.39+552210.3 - is a new cataclysmic variable (dwarf nova) in outburst, likely a superoutburst

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 20h 37m 49.39s +55d 22m 10.3s on 2012-10-22.49793 UT. The OT unfiltered magnitude is 14.1m (limit 18.6m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-10-05.52608 UT with unfiltered magnitude limit 18.7m.

This object is identical to the faint blue star visible on Palomar plates. It is present in GSC 2.3.2 with coordinates 20 37 49.310 +55 22 09.65 and magnitudes Fmag=20.38, jmag=21.31. Nothing is present at this position in USNO-B1.0, 2MASS, 1RXS, GCVS catalogs and AAVSO VSX. This area of sky is not covered by SDSS, GALEX and CSS. No previous outbursts were detected on 12 Palomar plates taken from 1952 July 30 to 1994 Aug. 14, as well as on 3 Palomar/NEAT images of 2002 Sep. 23.

Color-combined (BRIR) image is uploaded to http://master.sai.msu.ru/static/OT/J203749+552210-BRIR.jpg (5'x5' FOV). The galactic latitude is +8.5 deg. Based on the amplitude of variability we conclude that MASTER OT J203749.39+552210.3 is a new cataclysmic variable (dwarf nova) in outburst, likely a superoutburst. Follow up observations are encouraged. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/203749.39552210.3.png

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