Four Optical Transients discovered by MASTER

ATel #6352; V. Shumkov, P. Podvorotny, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, P. Balanutsa, 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), S. Shurpakov (MASTER team member), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 29 Jul 2014; 20:30 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J195541.63+121415.1 - new CV?

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 55m 41.63s +12d 14m 15.1s on 2014-07-21.90808 UT. The OT unfiltered magnitude is 18.1m (limit 19.3m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-05-25.99079 UT with unfiltered magnitude limit 18.8m.

There is nothing at this position in any catalogs and on DSS plates. This area of sky in Aquila is not covered by SDSS and CRTS. Color-combined (BRIR) finder chart is uploaded to http://master.sai.msu.ru/static/OT/J195541+121415-BRIR5x5.jpg (2x zoom).

MASTER OT J195541.63+121415.1 is likely a dwarf nova in outburst. Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/195541.63121415.1.png

MASTER OT J194942.98+102242.5 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 19h 49m 42.98s +10d 22m 42.5s on 2014-07-21.98939 UT. The OT unfiltered magnitude is 17.7m (limit 18.7m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2012-09-11.76608 UT with unfiltered magnitude limit 18.5m.

The object at quiescence is identical to the star SDSS J194943.08+102242.0 (u=21.42 g=21.00 r=20.34 i=20.22 z=19.83). The object was observed by MASTER-Kislovodsk at 19.8m on 2010-09-21.790 UT. MASTER OT J194942.98+102242.5 is a new cataclysmic variable (dwarf nova in outburst). The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194942.98102242.5.png

MASTER OT J172845.81+014538.3 - CV or PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 17h 28m 45.81s +01d 45m 38.3s on 2014-07-22.80706 UT. The OT unfiltered magnitude is 19.0m (limit 19.7m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2010-09-28.68619 UT with unfiltered magnitude limit 20.0m.

GSC 2.3.2 has an object present within 1" of the OT with Rmag=19.75, near-infrared Nmag=18.11 and eccentricity e=0.38. There is also an IR object 2MASS J17284581+0145396 (J=16.20+/-0.10 H=15.67+/-0.13 K=15.51+/-0.21) = WISE J172845.80+014539.4 (W1=15.42 W2=15.62). This area of sky in Ophiuchus is not covered by SDSS.

MASTER OT J172845.81+014538.3 is either a new cataclysmic variable or a possible supernova. Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/172845.81014538.3.png

MASTER OT J184548.94+223002.5 - new CV

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 18h 45m 48.94s +22d 30m 02.5s on 2014-07-25.77899 UT. The OT unfiltered magnitude is 18.0m (limit 18.8m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2011-10-14.65079 UT with unfiltered magnitude limit 19.3m.

There is nothing at this position in any catalogs. This area of sky in Hercules is not covered by SDSS and CRTS. A faint blue object is marginally visible on digitized Palomar plates. Color-combined DSS finder chart is uploaded to http://master.sai.msu.ru/static/OT/J184548+223002-BRIR5x5.jpg (2x zoom).

MASTER OT J184548.94+223002.5 is 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/184548.94223002.5.png

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