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Three OT's detected by MASTER

ATel #4529; P. Balanutsa, D. Denisenko, E. Gorbovskoy, V. Lipunov, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov, V. Echeistov, (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), V. Shumkov, S. Shurpakov, P. Podvorotny (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 30 Oct 2012; 19:03 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable

MASTER OT J194850.95+102828.1 - CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 19h 48m 50.95s +10d 28m 28.1s on 2012-10-28.48515 UT. The OT unfiltered magnitude is 16.3m (limit 17.4m). The OT is seen in 1 image. There is no minor planet at this place. We have reference image without OT on 2011-10-19.41791 UT with unfiltered magnitude limit 17.8m.

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, 1RXS, GCVS and AAVSO VSX. This area is not covered by GALEX and CRTS. The nearest object in SDSS is 5.5" away: SDSS J194850.67+102824.4.

The galactic latitude is -8 deg. Based on amplitude of variability we suggest that MASTER OT J194850.95+102828.1 is a new cataclysmic variable (dwarf nova) in outburst. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194850.95102828.1.png

MASTER OT J034225.47+434645.4 - CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 03h 42m 25.47s +43d 46m 45.4s on 2012-10-21.87683 UT. The OT unfiltered magnitude is 18.7m (limit 19.6m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-09-15.87164 UT with unfiltered magnitude limit 19.9m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/034225.47434645.4_1.png

The galactic latitude is -9 deg. There is nothing at this position in USNO-B1.0, 2MASS, 1RXS, GCVS and AAVSO VSX. This area is not covered by GALEX, SDSS and CRTS. However, there are two faint objects within 3" of the OT at the limit of digitized Palomar plates. One of them is present in GSC 2.3.2 with coordinates R.A. = 03 42 25.715, Decl. = +43 46 45.12 and Fmag=20.29. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J034225+434645-BRIR-5x5.jpg (FOV=5'x5').

Spectral observations are required.

MASTER OT J032215.93+432103.8 - CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 03h 22m 15.93s +43d 21m 03.8s on 2012-10-21.89792 UT. The OT unfiltered magnitude is 18.5m (limit 19.4m). The OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2011-10-27.98031 UT with unfiltered magnitude limit 20.0m.

The galactic latitude is -11.5 deg. There is nothing at this position in USNO-B1.0, 2MASS, 1RXS, GCVS and AAVSO VSX. This area is not covered by GALEX, SDSS and CRTS. However, there is a faint star within 1" of the OT at the limit of blue digitized Palomar plates which is showing the variability between different epochs. We suggest that MASTER OT J032215.93+432103.8 is a cataclysmic variable.

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/032215.93432103.8_1.png

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