New Bright CV detected by MASTER

ATel #5433; P. Balanutsa, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, V. Vladimirov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational 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 Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 29 Sep 2013; 12:09 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J051529.15+560532.0 - new bright CV with X-ray counterpart

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 05h 15m 29.15s +56d 05m 32.0s on 2013-09-27.71853 UT. The OT unfiltered magnitude is 14.1m (limit 16.7m). The OT is seen in 14 images. There is no minor planet at this place. We have reference image without OT on 2012-10-19.72941 UT with unfiltered magnitude limit 18.6m. There was a previous outburst as bright as R=14.4 on 2012 Jan. 09.570 and 09.601 UT fading to R=15.2 on 2012 Jan. 10.624 UT.

The OT at quiescence is identical to the blue star USNO-A2.0 1425-05899660 (R=17.6, B=18.0) = USNO-B1.0 1460-0154704 (05 15 29.011 +56 05 32.57 pmRA=0 pmDE=6 B1=18.76 R1=17.58 B2=18.30 R2=17.97 I=17.69). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J051529+560532-BRIR.jpg (10'x10' FOV). There is also an UV counterpart GALEX J051528.9+560531 (FUV=20.65+/-0.20, NUV=20.51+/-0.15). The object is in the error circle (formally 21" away) of ROSAT X-ray source 1RXS J051531.4+560525 with error radius 22", flux=0.0555+/-0.0126 cnts/s and hardness ratios HR1=0.78+/-0.17, HR2=0.14+/-0.24. Finally, there is Swift X-ray source 1SWXRT J051529.0+560531 (count rate 0.0363 cnts/s) 1" from the OT.

There is nothing at this position in GCVS and AAVSO VSX. Object was at minimum light on 9 DSS plates and on 3 NEAT images of 2002 Sep. 23. This area of sky in Auriga is not covered by SDSS and CRTS.

Based on the amplitude of variability and detection of quiescent UV and X-ray counterparts we suggest that MASTER OT J051529.15+560532.0 is most likely a cataclysmic variable (dwarf nova in outburst). Spectral and photometric observations are required. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/051529.15560532.0.jpg

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