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Two OTs detected by MASTER

ATel #4611; V. Echeistov, P. Balanutsa, D. Denisenko, 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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (Observatorio Astronomico Felix Aguilar; OAFA)
on 28 Nov 2012; 15:04 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J201053.41+441046.3 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 10m 53.41s +44d 10m 46.3s on 2012-11-23.67038 UT. The OT unfiltered magnitude is 17.4m (limit 18.7m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-09-15.71619 UT with unfiltered magnitude limit 19.7m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/201053.41441046.3_2.png

There is nothing at this position in 2MASS, USNO-B1.0, GSC 2.3.2, GALEX, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, CRTS and NEAT. There is a faint blue star (magnitude B~21.5) within 1" of the OT at the limit of blue POSS-II plate. Color-combined DSS image (5'x5' FOV) is posted at http://master.sai.msu.ru/static/OT/J201053+441046-BRIR5x5.jpg

The galactic latitude is +6 deg. Based on the blue color and amplitude of variability we suppose that MASTER OT J201053.41+441046.3 is most likely a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required.

MASTER OT J200456.30+542600.5 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 20h 04m 56.30s +54d 26m 00.5s on 2012-11-28.37030 UT. The OT magnitude in 'R' filter is 17.7m (limit 18.7m). The OT is seen in 22 images obtained during the observations of GRB 121128A afterglow (Oates et al., GCN #14007). It is located at 23.5' from the GRB and is not related to it. Observers of GRB 121128A are encouraged to check their images for the presence of the OT. The object is also present on a single MASTER-Amur image on 2012-11-20.497 UT with unfiltered magnitude 16.6. We have reference images without OT on 2012-10-17.562 UT with unfiltered magnitude limit 18.9m and on 2012-10-30.462 UT (17.9m).

Nothing is present at this position in any catalogs. No previous outbursts were detected on 9 DSS plates and on 3 NEAT images of 2002 Sep. 23 (m_lim~20). This area is not covered by SDSS and CRTS.

The galactic latitude is +12 deg. Based on the amplitude of variability (more than 4m) we suggest that MASTER OT J200456.30+542600.5 is a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required.

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