Possible new CV detected by MASTER

ATel #5413; D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, 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 24 Sep 2013; 10:11 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J044346.07+394301.7 - new CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 04h 43m 46.07s +39d 43m 01.7s on 2013-09-20.60176 UT. The OT unfiltered magnitude is 15.6m (limit 17.2m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2013-04-04.50495 UT with unfiltered magnitude limit 17.7m.

The object has shown large variability having faded by ~0.7m on the images obtained 45 minutes later:

Obs.Date, UT  Magn. Error 
------------------------- 
20130920.601  15.76  0.11 
20130920.602  15.61  0.11 
20130920.633  16.48  0.17 
20130920.634  16.34  0.15

However, it is still present on confirmation images obtained by MASTER-Tunka two days later:

Obs.Date, UT  Magn. Error 
------------------------- 
20130922.852  16.87  0.20 
20130922.854  16.03  0.18

The OT at quiescence is identical to USNO-B1.0 1297-0111783 (04 43 46.005 +39 43 02.41 B1=20.54 R2=19.75 I=18.67). Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J044346+394301-BRIR5x5.jpg (2x zoom). There is also a near-infrared counterpart in UKIDSS Galactic Plane Survey UGPS J044346.06+394302.2 with rather red color: J=18.66+/-0.05, H=18.44+/-0.09, K=17.71+/-0.12.

There is nothing at this position in 1RXS, GALEX, 2MASS, GCVS and AAVSO VSX. This area of sky in Perseus is not covered by SDSS, CRTS and NEAT. Based on the amplitude of variability (~4m) we suggest that MASTER OT J044346.07+394301.7 is likely a dwarf nova in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/044346.07394301.7.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net