Three bright OTs detected by MASTER

ATel #4664; V. Shumkov, S. Shurpakov, D. Denisenko, P. Balanutsa, V. Lipunov, E. Gorbovskoy, V. Lipunov, N. Tiurina, 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 (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, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 21 Dec 2012; 09:17 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J150354.87+420655.3 - PSN in UGC 9684

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 15h 03m 54.87s +42d 06m 55.3s on 2012-12-20.83841 UT. The OT unfiltered magnitude is 16.0m (limit 18.1m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2011-03-24.71962 UT with unfiltered magnitude limit 19.4m. The OT is located 48.7" east and 0.4" south of the nucleus of UGC 9684 galaxy. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/150354.87420655.3.png

The possible supernova was already marginally visible on MASTER-Amur unfiltered images obtained on 2012 Dec. 15 (m_lim=16.3), but not on 2012 Nov. 29 images (m_lim=17.7). Stack of four Dec. 15 images is uploaded to http://master.sai.msu.ru/static/OT/PSNJ150354+420655-Dec15.jpg

Spectral observations are required.

MASTER OT J191156.83+403101.6 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 19h 11m 56.83s +40d 31m 01.6s on 2012-12-20.41845 UT. The OT unfiltered magnitude is 16.7m (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 2012-08-22.68913 UT with unfiltered magnitude limit 18.4m.

The object is not present in 2MASS, USNO-B1.0, GSC, 1RXS, GCVS catalogs and AAVSO VSX. There is nothing at this position on digitized Palomar plates to limiting mag ~21.5. Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J191156+403101-BRIR5x5.jpg This area of sky is not covered by SDSS, CRTS, NEAT and GALEX.

Based on the amplitude of variability (at least ~5m) we conclude that MASTER OT J191156.83+403101.6 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/191156.83403101.6.png

MASTER OT J202225.43+511248.0 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 20h 22m 25.43s +51d 12m 48.0s on 2012-12-20.47796 UT. The OT unfiltered magnitude is 15.7m (limit 17.8m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-10-25.41159 UT with magnitude limit in 'V' filter 18.3m.

Nothing is present at this position in 2MASS, USNO-B1.0, GSC, 1RXS, GCVS catalogs and in AAVSO VSX. This area of sky is not covered by SDSS, CRTS and GALEX. No previous outbursts were detected on 6 Palomar/NEAT images obtained on 2002 Sep. 24. There is a faint blue star visible on digitized Palomar plates (magnitude ~21.5). Color-combined finder chart is uploaded to http://master.sai.msu.ru/static/OT/J202225+511248-BRIR5x5.jpg

Based on the amplitude of variability (about 6m) we conclude that MASTER OT J202225.43+511248.0 is a new cataclysmic variable (dwarf nova) in outburst, likely a superoutburst. Follow up observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/202225.43511248.0.png

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