Two bright OTs detected by MASTER

ATel #4837; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, D. Zimnukhov, V. Yecheistov (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, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 23 Feb 2013; 21:21 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J004008.26+492807.5 - new CV?

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 00h 40m 08.26s +49d 28m 07.5s on 2013-02-23.51649 UT. The OT unfiltered magnitude is 16.8m (limit 17.7m). The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2012-09-24.68811 UT with unfiltered magnitude limit 19.3m.

The object is not present in 2MASS, USNO-B1.0, 1RXS and GCVS catalogs, as well as in AAVSO VSX. This area of sky is not covered by SDSS, CRTS and GALEX. Object was not detected on 3 Palomar/NEAT images taken on 2002 Sep. 24. There is nothing at this position on digitized Palomar plates to limiting mag ~21. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J004008+492807-BRIR5x5.jpg (5'x5' FOV).

Based on the amplitude of variability (more than 4m) we suggest that MASTER OT J004008.26+492807.5 is most 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/004008.26492807.5.png

MASTER OT J173432.51+434219.4 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 17h 34m 32.51s +43d 42m 19.4s on 2013-02-23.78575 UT. The OT unfiltered magnitude is 15.9m (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 2012-10-19.41840 UT with unfiltered magnitude limit 18.5m.

The object is not present in 2MASS, USNO-B1.0, GALEX, 1RXS and GCVS catalogs, as well as in AAVSO VSX. It was not visible on 3 Palomar/NEAT images taken on 1998 June 24. There is nothing at this position on 9 digitized Palomar plates and on SDSS color-combined image to limiting mag ~23. There are no previous detections in CRTS Data Release 2.

Based on the amplitude of variability (more than 7m) we conclude that MASTER OT J173432.51+434219.4 is a new cataclysmic variable (dwarf nova) of UGWZ or UGSU subtype in superoutburst.

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/173432.51434219.4.png

Global MASTER Robotic Net