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MASTER Discovery of Two New CVs and Possible Supernova

ATel #6746; P. Balanutsa, A. Rufanov, N. Tiurina, D. Denisenko, V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Shumkov, S. Shurpakov (MASTER team members)
on 24 Nov 2014; 18:46 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

MASTER OT J231823.85+455358.5 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 23h 18m 23.85s +45d 53m 58.5s on 2014-11-21.60100 UT. The OT unfiltered magnitude is 18.8m (limit 20.1m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-08-01.75332 UT with unfiltered magnitude limit 19.9m.

The OT is identical to the blue star USNO-B1.0 1358-0512216 (B1=21.20 B2=20.78) with proper motion (-2.9, 0.4) mas/yr in PPMXL catalog. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J231823+455358-BRIR5x5.jpg (2x zoom). Nothing is present at this position in 1RXS, GALEX, 2MASS, GCVS and AAVSO VSX. This area of sky in Andromeda is not covered by SDSS, NEAT and CRTS.

Based on the blue color, proper motion and amplitude of variability, MASTER OT J231823.85+455358.5 is a new cataclysmic variable (dwarf nova in outburst). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/231823.85455358.5.png

MASTER OT J070835.05+275326.6 - possible new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 07h 08m 35.05s +27d 53m 26.6s on 2014-11-22.01006 UT. The OT unfiltered magnitude is 19.7m (limit 20.2m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-12-06.96181 UT with unfiltered magnitude limit 21.6m.

There is nothing at this position in any catalogs, on the digitized Palomar plates and on their sum to ~22m. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J070835+275326-BRIR5x5.jpg (2x zoom). This area of sky in Gemini is not covered by SDSS, GALEX and CRTS. No previous outbursts were detected by Palomar/NEAT project on 27 images from 7 different night between 1998 Feb. 27 and 2002 Feb. 22.

MASTER OT J070835.05+275326.6 is likely a new cataclysmic variable (dwarf nova in outburst). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/070835.05275326.6.png

MASTER OT J095757.42+084120.3 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 09h 57m 57.42s +08d 41m 20.3s on 2014-11-24.05660 UT. The OT unfiltered magnitude is 18.7m (limit 20.3m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2010-03-12.79431 UT with unfiltered magnitude limit 20.2m.

The OT is located 3" west and 8" south of the center of galaxy SDSS J095757.59+084128.1 (g=21.10 r=20.57 i=20.27) with unknown redshift. Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/095757.42084120.3.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net