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New CV and Possible Supernova discovered by MASTER

ATel #6024; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 29 Mar 2014; 15:33 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

Referred to by ATel #: 6071

MASTER OT J192757.03+404042.8 - new CV in Kepler field

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 27m 57.03s +40d 40m 42.8s on 2014-03-28.08035 UT. The OT unfiltered magnitude is 15.2m (limit 17.8m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2014-02-13.11612 UT with unfiltered magnitude limit 18.5m.

The OT at quiescence is identical to the blue star USNO-B1.0 1306-0333085 (19 27 57.084 +40 40 44.42 B1=19.57 B2=20.02) with the proper motion pmRA=-4.4, pmDE=-20.4 mas/yr in PPMXL catalogue. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J192757+404042-BRIR5x5.jpg (2x zoom). The star was included into Kepler Input Catalogue as KIC 5448945. There is also an UV counterpart GALEX J192757.0+404042 (NUV=19.90+/-0.15). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Lyra is not covered by SDSS and CRTS.

Based on the blue color, proper motion and amplitude of variability (~5m), MASTER OT J192757.03+404042.8 is most likely a dwarf nova of SU UMa (UGSU) type in superoutburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/192757.03404042.8.png

MASTER OT J162655.28+333824.4 - Possible Supernova or Large Amplitude Dwarf Nova

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 16h 26m 55.28s +33d 38m 24.4s on 2014-03-28.77928 UT. The OT unfiltered magnitude is 16.8m (limit 19.5m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2012-02-21.93642 UT with unfiltered magnitude limit 19.8m.

The new object is located 9" west and 6" north of the center of galaxy SDSS J162656.04+333818.3 (g=20.38 r=19.38 i=18.89). However, there is a faint object within 1.5" of the OT listed as galaxy in SDSS catalogue: SDSS J162655.31+333822.9 (g=22.64 r=22.52 i=23.22). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. No previous outbursts were detected by Catalina Sky Survey.

Based on the outburst amplitude (~6m), MASTER OT J162655.28+333824.4 is either a supernova or a dwarf nova in superoutburst. Spectral confirmation and follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/162655.28333824.4.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net