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Three bright OTs detected by MASTER

ATel #4797; V. Yecheistov, D. Denisenko, V. Lipunov, E. Gorbovskoy, 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, 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 7 Feb 2013; 18:06 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J024850.29+401449.5 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 02h 48m 50.29s +40d 14m 49.5s on 2013-02-03.63411 UT. The OT unfiltered magnitude is 15.9m (limit 18.5m). The OT is seen in 3 images. We have reference image without OT on 2013-01-08.40264 UT with the limit 18.3m.

There is a faint star (~20m) at this position on DSS plates named USNO-B1.0 1302-0049046 (02 48 50.294 +40 14 48.36, B2=20.37, R2=19.04).

Nothing is present at this position in 2MASS, 1RXS, GALEX, GCVS and AAVSO VSX. This area of sky is not covered by SDSS. No previous outbursts were detected on 6 Palomar/NEAT images obtained on 2002 Oct. 19 and Nov. 15. There are no detections in CRTS DR 2.

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/024850.29401449.5.png

MASTER OT J061904.85+291606.4 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 06h 19m 04.85s +29d 16m 06.4s on 2013-02-04.57531 UT. The OT unfiltered magnitude is 14.8m (limit 18.4m). The OT is seen in 2 images. We have reference image without OT on 2013-01-21.59696 UT with the limit 17.8m.

The object is identical to the blue 19m star on Palomar plates which is present in catalogs as USNO-A2.0 1125-03753085 (B=19.4, R=19.2), USNO-B1.0 1192-0121844 (B1=19.55, R1=19.36, B2=20.35). Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J061904+291606-BRIR5x5.jpg (5'x5' FOV at 2x zoom). This area of sky is not covered by SDSS, CRTS and GALEX. Nothing is present at this position in 2MASS, 1RXS, GCVS and AAVSO VSX.

The field of MASTER OT J061904.85+291606.4 was observed by Palomar/NEAT project with 29 images obtained on 11 different nights from 2001 Oct. 03 to 2003 Jan. 14. The star was going into outburst on three 2001 Oct. 04 images and in bright outburst on three 2002 Dec. 05 images.

Based on the blue color and presence of previous outbursts we conclude that MASTER OT J061904.85+291606.4 is a new cataclysmic variable (dwarf nova).

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/061904.85291606.4.png

MASTER OT J070314.79+202133.9 - new bright CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 07h 03m 14.79s +20d 21m 33.9s on 2013-02-04.58318 UT. The OT unfiltered magnitude is 14.9m (limit 18.3m). The OT is seen in 2 images. We have reference image without OT on 2012-12-16.78124 UT with the limit 18.6m.

There is a blue 19m star on DSS plates named USNO-B1.0 1103-0133443 with coordinates 07 03 14.881 +20 21 33.71 (formally 1.3" from the OT) and magnitudes B2=19.40, R2=19.09, I=18.13. Color-combined (BRIR) DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J070314+202133-BRIR5x5.jpg (5'x5' FOV at 2x zoom).

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

The field of MASTER OT J070314.79+202133.9 was observed by the NEAT project on 26 different nights from 1997 Feb. 07 to 2003 Jan. 2002. A total of 68 images were taken. The star was detected in outburst on 6 images obtained on 2002 Feb. 05-06 but at quiescence otherwise.

No previous outbursts were detected by the MLS, according to CRTS Data Release 2.

Based on the amplitude of variability and detection of a previous outburst we conclude that MASTER OT J070314.79+202133.9 is a new cataclysmic variable (dwarf nova).

Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/070314.79202133.9.png

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