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Two bright notable OTs discovered by MASTER

ATel #4662; V. Yecheistov, 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, V. Shumkov, (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 20 Dec 2012; 16:13 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Nova

MASTER OT J221510.66+684428.8 - CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 22h 15m 10.66s +68d 44m 28.8s on 2012-12-19.47498 UT. The OT unfiltered magnitude is 17.1m (limit 18.2m). The OT is seen in 4 images. There are no objects at SDSS up to 23 mag at this place. There is nothing at this position in any catalogs. We have reference image without OT on 2011-08-27.59116 UT with magnitude limit in 'R' filter 18.6m. The object has brightened to 16.7m by 2012-12-19.644 UT.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/221510.66684428.8.png

MASTER OT J132104.04+560957.8 - CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 13h 21m 04.04s +56d 09m 57.8s on 2012-12-19.72653 UT. The OT unfiltered magnitude is 17.3m (limit 18.5m). The OT is seen in 9 images. We have reference image without OT on 2012-08-20.58123 UT with unfiltered magnitude limit 18.8m.

The object is identical to the star SDSS J132104.01+560958.1 (u=22.30 g=21.65 r=21.25 i=20.65 z=20.11). It is also visible at the limit of digitized POSS plates and is present in GSC 2.3.2 with coordinates (J2000.0) 13 21 04.078 +56 09 58.33 and Fmag=20.65. There is nothing at this position in USNO-B1.0, 2MASS, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by GALEX.

The object was observed by MASTER-Kislovodsk several times in 2010-2012. It was varying between 16.3 and 18.8m. During the observations on 2012 July 06 it has shown the fast variability changing its brightness by 2 mag in 30 minutes:

2012-07-06 21:03:37 18.41
2012-07-06 21:36:54 16.43
2012-07-06 22:10:11 17.55

Catalina Sky Survey had observed this object with 59 positive detections in 2007-2012. CRTS data also show fast variability. We suggest that MASTER OT J132104.04+560957.8 is the new cataclysmic variable of AM Her type (polar) in a high state.

Time-resolved photometric, spectroscopic and X-ray observations are encouraged.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/132104.04560957.8_1.png

List of optical transients discovered by MASTER

Global MASTER Robotic Net