Three OTs detected by MASTER

ATel #4926; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov, 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 29 Mar 2013; 17:41 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J122114.34+472950.7 - PSN

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 12h 21m 14.27s +47d 29m 51.4s on 2013-03-28.48019 UT. The OT unfiltered magnitude is 16.8m (limit 17.9m). The OT is seen in 4 images. We have reference image without OT on 2013-02-21.6928 UT with m_lim=18.3.

The object was already present on Mar. 21.757 and 25.462 UT MASTER-Amur images at 17.7+/-0.3m but was not detected automatically then.

The OT is located 1.8" east and 0.3" south of g=22.87, r=22.27 object SDSS J122114.16+472951.0 with type GALAXY in SDSS. No previous outbursts were detected on 12 digitized Palomar plates and by Catalina Sky Survey.

We suppose that MASTER OT J122114.34+472950.7 is a possible luminous supernova. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/122114.27472951.4.png

MASTER OT J185838.73+460207.2 - new CV in Kepler field

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 18h 58m 38.73s +46d 02m 07.2s on 2013-03-28.69633 UT. The OT unfiltered magnitude is 15.8m (limit 17.7m). The OT is seen in 2 images. We have reference image without OT on 2012-10-11.45074 UT with m_lim=18.8.

The object is identical to the star USNO-B1.0 1360-0297059 (18 58 38.716 +46 02 07.72 B1=20.82 R1=19.83 B2=20.21 R2=19.63 I=N/A) and USNO-A2.0 1350-10081606 (18 58 38.71 +46 02 07.8 R=19.1 B=19.4). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Lyra is not covered by SDSS. No previous outbursts were detected by CRTS and on 9 Palomar plates. Color-combined (BRIR) DSS image is uploaded to http://master.sai.msu.ru/static/OT/J185838+460207-BRIR.jpg (10'x10' FOV).

The object has two entries in GALEX catalog: GALEX J185838.9+460206 (NUV=20.98+/-0.16) and GALEX J185838.7+460207 (NUV=16.90+/-0.00). It was obviously in outburst on 2009-05-12 during the long exposure observations of Kepler 07B field and at quiescence on 2009-08-07. Comparison of 2009 May 12 and Aug. 07 GALEX NUV images is uploaded to http://master.sai.msu.ru/static/OT/J185838+460207-GALEX.jpg

Based on amplitude of variability we conclude that MASTER OT J185838.73+460207.2 is a cataclysmic variable (dwarf nova). Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/185838.73460207.2.png

MASTER OT J184141.08+324317.2 - new CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 18h 41m 41.08s +32d 43m 17.2s on 2013-03-28.75608 UT. The OT unfiltered magnitude is 15.6m (limit 17.5m). The OT is seen in 2 images. We have reference image without OT on 2012-12-21.39998 UT with m_lim=17.5.

The OT is identical to the star USNO-B1.0 1227-0398599 (18 41 41.037 +32 43 18.85 pmRA=-18 pmDE=20 B1=20.68 R1=N/A B2=21.26 R2=19.68 I=19.08). It was in outburst on 1989 July 05 blue Palomar plate but at quiescence on 1991 July 14 plate. It is present in GSC 2.2 with Bmag=16.35 (Epoch 1989.508) and in GSC 2.3.2 with jmag=21.61 (Epoch 1991.535). Color-combined (BRIR) DSS chart is posted at http://master.sai.msu.ru/static/OT/J184141+324317-BRIR5x5.jpg (5'x5' FOV).

There is an UV counterpart GALEX J184141.0+324318 (NUV=17.94+/-0.03) but nothing in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Lyra is not covered by CSS and SDSS.

Based on amplitude of variability we conclude that MASTER OT J184141.08+324317.2 is a 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/184141.08324317.2.png

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