Bright OT detected by MASTER

ATel #4847; V. Yecheistov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, 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, 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 1 Mar 2013; 13:46 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J042341.77+765237.0 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 04h 23m 41.77s +76d 52m 37.0s on 2013-02-25.59012 UT. The OT unfiltered magnitude is 16.0m (limit 17.7m). The OT is seen in 4 images. We have reference image without OT on 2012-08-15.73751 UT with unfiltered magnitude limit 19.2m. Object was confirmed on MASTER-Kislovodsk image on 2013-02-26.847 UT (mag 16.0).

There is a faint star at this position on digitized Palomar plates. It is present in catalogs as USNO-A2.0 1650-00821921 (04 23 41.61 +76 52 37.2 R=19.3 B=19.7) and USNO-B1.0 1668-0029954 (04 23 41.905 +76 52 37.43 pmRA=26 pmDE=-4 B1=20.66 R1=19.98 B2=20.34 R2=N/A I=18.27). Color-combined (BRIR) image is uploaded to http://master.sai.msu.ru/static/OT/J042341+765237-BRIR5x5.jpg

The object has an UV counterpart GALEX J042341.9+765237 (NUV=22.05+/-0.32). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky is not covered by SDSS and CRTS. No previous outburst was detected on 3 Palomar/NEAT images obtained on 1998 Nov. 16.

Based on the amplitude of variability and UV detection by GALEX we suggest that MASTER OT J042341.77+765237.0 is a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/042341.77765237.0.png

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