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New CV and Possible Supernova discovered by MASTER

ATel #6163; 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), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), 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 23 May 2014; 13:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

MASTER OT J173618.08+752123.3 - new CV

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 17h 36m 18.08s +75d 21m 23.3s on 2014-05-22.64090 UT. The OT unfiltered magnitude is 17.5m (limit 19.2m). The OT is seen in 6 images. There is no minor planet at this place. We have reference image without OT on 2011-05-25.74323 UT with unfiltered magnitude limit 22.1m.

The OT at quiescence is identical to the blue star USNO-B1.0 1653-0083378 (17 36 18.130 +75 21 23.40 B1=20.39 R1=N/A B2=19.31 R2=N/A) with proper motion pmRA=-7.5 pmDE=-12.4 mas/yr in PPMXL. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J173618+752123-BRIR5x5.jpg (2x zoom). The object has an UV counterpart with two entries in GALEX data release 6: GALEX J173618.0+752123 (FUV=20.73+/-0.30 NUV=20.16+/-0.15) and GALEX J173618.1+752123 (FUV=21.05+/-0.29 NUV=20.77+/-0.22). There is nothing at this position in 1RXS, 2MASS, GCVS and AAVSO VSX. This area of sky in Draco is not covered by SDSS and CRTS.

Based on the blue color, proper motion and amplitude of variability (~3m), MASTER OT J173618.08+752123.3 is a new cataclysmic variable, most likely a dwarf nova in outburst. Follow up observations are encouraged. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/173618.08752123.3.png

MASTER OT J155956.39+193108.8 - possible Supernova

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 15h 59m 56.39s +19d 31m 08.8s on 2014-05-22.93148 UT. The OT unfiltered magnitude is 19.1m (limit 20.1m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-05-09.99644 UT with unfiltered magnitude limit 19.6m.

The new object is located 9" west and 4" south of the center of galaxy SDSS J155957.01+193112.8 (g=17.90 r=17.41 i=17.08) with z=0.0407. Spectral confirmation is required. Discovery and reference images are available at: http://master.sai.msu.ru/static/OT/155956.39193108.8.jpg

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net