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New CV and possible SN detected by MASTER

ATel #4933; V. Yecheistov, S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, P. Balanutsa, 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, A. Frolova, (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 (OAFA)
on 1 Apr 2013; 17:48 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

MASTER OT J211855.08+280314.9 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 21h 18m 55.08s +28d 03m 14.9s on 2013-03-30.81471 UT. The OT unfiltered magnitude is 16.3m (limit 17.3m). The OT is seen in 4 images. We have reference image without OT on 2012-08-22.74248 UT with unfiltered magnitude limit 19.1m. The OT has brightened to 15.7m on MASTER-Amur image of 2013-03-31.819 UT. It was also found in MASTER database at 15.9m on 2012-05-03.744 UT.

The object was detected in outburst on 1995-08-25 red and 1995-08-28 infrared Palomar plates and at quiescence on remaining 10 DSS images. It is present in USNO catalogue as USNO-B1.0 1180-0653229 (21 18 55.124 +28 03 15.55 pmRA=58 pmDE=-26 B2=21.16 R2=16.81 I=17.38) and in GSC 2.3.2 (21 18 55.140 +28 03 16.00 Fmag=20.10 jmag=21.28 Nmag=17.18). Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J211855+280314-BRIR5x5.jpg

Nothing is present at this position in 2MASS, 1RXS, GCVS and AAVSO VSX. This area of sky in Vulpecula is not covered by SDSS and CSS.

Based on the amplitude of variability and previous detections we conclude that MASTER OT J211855.08+280314.9 is a new cataclysmic variable (dwarf nova) at the early stage of outburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/211855.08280314.9.png

MASTER OT J071326.71+260454.0 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 07h 13m 26.71s +26d 04m 54.0s on 2013-03-31.76846 UT. The OT unfiltered magnitude is 18.5m (limit 19.2m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2010-12-06.95932 UT with unfiltered magnitude limit 22.0m.

The OT is located 1" west and 13" north of the center of galaxy 2MASX J07132676+2604406. This area of sky is not covered by SDSS. No previous outbursts were detected by Catalina Sky Survey. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J073126+260454-BRIR5x5.jpg

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/071326.71260454.0.png

List of optical transients discovered by MASTER

Global MASTER Robotic Net