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Two bright OTs detected by MASTER

ATel #4585; S. Shurpakov, D. Denisenko, P. Balanutsa, V. Lipunov, N. Tiurina, E. Gorbovskoy, 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), 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 18 Nov 2012; 07:41 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable

MASTER OT J061017.75+414545.7 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 10m 17.75s +41d 45m 45.7s on 2012-11-16.60613 UT. The OT unfiltered magnitude is 16.9m (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 2011-01-26.61419 UT with magnitude limit in 'R' filter 19.0m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/061017.75414545.7.png

Nothing is present at this position in 2MASS, USNO-B1.0, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area is not covered by CRTS, SDSS and GALEX. There is a faint star visible at the limit of combined Palomar plates (~22.5m). Palomar/NEAT project has 24 images of this field on 4 nights from 2001 Dec. 20 to 2002 Feb. 26. The faint object (mag ~22.5) is also visible on the sum of NEAT images. The comparison of NEAT and color-combined DSS images is posted at http://master.sai.msu.ru/static/OT/J061017+414545-NEAT-BRIR.jpg

The galactic latitude is +11 deg. Based on the amplitude of variability we suggest that MASTER OT J061017.75+414545.7 most likely is a new cataclysmic variable (dwarf nova) in outburst. Follow up observations are required.

MASTER OT J064643.02+412059.1 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 06h 46m 43.02s +41d 20m 59.1s on 2012-11-17.90716 UT. The OT unfiltered magnitude is 16.4m (limit 19.8m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2009-10-18.04080 UT with magnitude limit in 'R' filter 19.6m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/064643.02412059.1.png

Nothing is present at this position in 2MASS, USNO-B1.0, 1RXS and GCVS catalogs, as well as in AAVSO VSX. No previous outbursts were detected by CRTS. Nothing is visible on the sum of 8 DSS plates to the limiting magnitude 22. This area of sky is not covered by SDSS.

This field was observed by GALEX in 2006 and 2007. The object was detected in bright outburst on 2006 Dec. 30 as GALEX J064643.0+412059 (FUV=17.22+/-0.04 NUV=17.63+/-0.03) and in quiescence on 2007 Dec. 21 as GALEX J064643.0+412058 (FUV=23.80+/-0.33 NUV=N/A). Comparison of two near-UV GALEX images is uploaded to http://master.sai.msu.ru/static/OT/J064643+412059-GALEX.jpg

Palomar/NEAT archive has 58 images of this field obtained on 12 different nights from 1997 Oct. 30 to 2003 Jan. 22. The object was in bright outburst on four images of 2002 Dec. 12 and at quiescence on other images. Comparison of NEAT images in outburst and at quiescence (sum of 25 best images, m_lim~22) is posted at http://master.sai.msu.ru/static/OT/J064643+412059-NEAT.jpg

Based on amplitude of variability and presence of previous outbursts we conclude that MASTER OT J064643.02+412059.1 is the new cataclysmic variable (dwarf nova). Follow up observations are required.

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