Possible Supernova and two CVs discovered by MASTER

ATel #4963; S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, 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. Balanutsa, P. Podvorotny, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 9 Apr 2013; 07:58 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J075942.06+560045.8 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 07h 59m 42.06s +56d 00m 45.8s on 2013-03-31.79620 UT. The OT unfiltered magnitude is 18.0m (limit 19.4m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-12-17.79814 UT with unfiltered magnitude limit 19.4m.

This area of sky in Lynx is not covered by SDSS. There is nothing at this position in any catalogs. However, a faint object is present on digitized Palomar plates which appears diffuse. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J075942+560045-BRIR5x5.jpg

Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/075942.06560045.8.png

MASTER OT J175502.06-005141.2 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 17h 55m 02.06s -00d 51m 41.2s on 2013-04-06.05674 UT. The OT unfiltered magnitude is 16.1m (limit 17.9m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-05-24.92549 UT with unfiltered magnitude limit 19.0m.

This area of sky in Ophiuchus is not covered by CRTS and NEAT. SDSS has missed the object by 1'. There is nothing at this position in 1RXS, 2MASS, USNO, GCVS and AAVSO VSX. However, there is a faint (~22m) star on the sum of digitized Palomar plates. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J175502-005141-BRIR5x5.jpg

Based on the amplitude of variability we suggest that MASTER OT J175502.06-005141.2 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/175502.06-005141.2.png

MASTER OT J063215.44+420046.1 - new CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 32m 15.44s +42d 00m 46.1s on 2013-04-08.53383 UT. The OT unfiltered magnitude is 17.7m (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 2011-01-31.55872 UT with unfiltered magnitude limit 19.0m.

There is nothing at this position in any catalogs and on digitized Palomar plates to 21m. This area of sky in Auriga is not covered by SDSS. No previous outbursts were detected on 26 Palomar/NEAT images obtained on 8 different nights from 2001 Dec. 20 to 2003 Jan. 08. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J063215+420046-BRIR.jpg (10'x10' FOV).

We suppose that MASTER OT J063215.44+420046.1 is likely a dwarf nova in outburst. Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/063215.44420046.1.png

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