New Bright CV detected by MASTER

ATel #5049; D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, 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, A. Frolova (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, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 5 May 2013; 10:25 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J094759.83+061044.4 - new bright CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 09h 47m 59.83s +06d 10m 44.4s on 2013-05-04.79277 UT. The OT unfiltered magnitude is 13.6m (limit 17.8m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-02-24.83813 UT with unfiltered magnitude limit 20.2m.

The OT is identical to the blue star SDSS J094759.82+061043.8 (u=20.04 g=20.42 r=20.19 i=20.27 z=20.26) = USNO-B1.0 0961-0183897 (09 47 59.811 +06 10 44.50 pmRA=-6 pmDE=18 B1=19.30 B2=20.33 R2=19.58 I=18.67). There is a quiescent UV counterpart with two entries in GALEX catalog: GALEX J094759.8+061044 (FUV=20.18+/-0.06, NUV=20.15+/-0.04) and GALEX J094759.8+061043 (FUV=19.91+/-0.13, NUV=20.22+/-0.10). Finally, there is an UKIDSS-DR8 IR detection ULAS J094759.82+061043.6 (Y=19.78+/-0.13, J=19.35+/-0.14, H=18.88+/-0.15).

This area of sky in Sextans was observed by CRTS (Catalina and Mount Lemmon Surveys). Two previous outbursts were detected by CSS on 2005 May 30 (15.8m) and 2006 Dec. 12 (15.3m). There are more than 120 observations of this field by NEAT project from 1996 to 2006, but the archival images are currently not available from SkyMorph website.

We also note that the OT is located 10" west and 19" south of PGC 3091832 galaxy, but is definitely not related to it. Based on the outburst amplitude (~6m), blue color and previous detections we conclude that MASTER OT J094759.83+061044.4 is a new cataclysmic variable, most likely a dwarf nova of SU UMa (UGSU) subtype in superoutburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/094759.83061044.4.png

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