Bright CV discovered by MASTER

ATel #5065; D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov (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 14 May 2013; 19:35 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J131320.24+692649.1 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 13h 13m 20.24s +69d 26m 49.1s on 2013-05-14.58892 UT. The OT unfiltered magnitude is 14.7m (limit 18.5m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-12-22.86316 UT with unfiltered magnitude limit 18.9m.

There is a blue star within 1" of the OT on the digitized Palomar plates which is present in USNO-B catalogue as USNO-B1.0 1594-0116928 (13 13 20.230 +69 26 49.66 R1=19.64 R2=19.80) and USNO-B1.0 1594-0116930 (13 13 20.416 +69 26 49.13 B1=19.98 R1=19.87 B2=20.38). Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J131320+692649-BRIR.jpg (10'x10' FOV). The OT also has an UV counterpart GALEX J131320.3+692648 (FUV=20.71+/-0.26 NUV=20.60+/-0.19). The object is not present in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky is not covered by SDSS. No previous outbursts were detected by Catalina Sky Survey.

Based on the outburst amplitude (~5m), blue color and UV counterpart we suggest that MASTER OT J131320.24+692649.1 is most likely a new cataclysmic variable (dwarf nova). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/131320.24692649.1.png

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