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One bright blue OT detected by MASTER and Corrigendum to ATel #4446

ATel #4465; P. Podvorotny, D. Denisenko, E. Gorbovskoy, V. Lipunov, P. Balanutsa, 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), 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 9 Oct 2012; 07:43 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J071856.78+601833.3 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 07h 18m 56.78s +60d 18m 33.3s on 2012-10-08.08789 UT. The OT unfiltered magnitude is 15.5m (limit 18.8m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-11-07.98868 UT with magnitude limit in 'BLANK' filter 19.7m.

There is nothing at this position in USNO-B1.0, GSC 2.3.2, 2MASS, GALEX, 1RXS, GCVS catalogs and in AAVSO VSX. This area is not covered by SDSS and NEAT.

Nothing is visible at the position of the OT on 9 available DSS plates and on their combination down to limiting magnitude ~21.5. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J071856+601833-BRIR.jpg (10'x10' FOV).

We have obtained follow-up images with MASTER-Tunka telescope simultaneously in two filters on 2012 Oct. 08.842 UT. The photometry is as follows: V=15.6, I=15.8.

Based on the amplitude of variability (more than 6m) and color (V-I=-0.2) we suggest that MASTER OT J071856.78+601833.3 is likely 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/071856.78601833.3.png

Corrigendum to ATel #4446

ATel #4446 says the field of MASTER OT J054317.95+093114.8 is not covered by CSS. According to the private communication by A. Drake, Catalina Sky Survey has actually observed this field in the past, but nothing was detected at that location. We thank Andrew Drake for the correction.

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