New CV and possible SN detected by MASTER

ATel #5147; N. Tiurina, S. Shurpakov, D. Denisenko, V. Lipunov, E. Gorbovskoy, P. Balanutsa, V. Kornilov, A. Belinski, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Yecheistov (Moscow State University, SAI), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress, A. Frolova (Irkutsk State University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), P. Podvorotny, V. Shumkov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez and F. Podest (OAFA)
on 19 Jun 2013; 15:21 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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MASTER OT J184843.52+295451.0 - CV

MASTER-Amur auto-detection system discovered OT source at (RA, Dec) = 18h 48m 43.52s +29d 54m 51.0s on 2013-06-17.64479 UT. The OT unfiltered magnitude is 16.9m (limit 18.7m). The OT is seen in 2 images. There is no minor planet at this place. We have reference unfiltered image without OT on 2013-04-19.69906 UT with magnitude limit 18.1m.

There is nothing at this position in 1RXS, GCVS and AAVSO VSX. This area of sky in Lyra is not covered by SDSS and Catalina Sky Survey. A faint blue star (~21m) is visible at this position on the sum of digitized Palomar plates. Color-combined (BRIR) image is uploaded to http://master.sai.msu.ru/static/OT/J184843+295451-BRIR5x5.jpg

Based on the amplitude of variability (~4m) we suggest that MASTER OT J184843.52+295451.0 is a new cataclysmic variable (dwarf nova in outburst). Follow up observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/184843.52295451.0.png

MASTER OT J154951.14+605448.1 - PSN

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 15h 49m 51.14s +60d 54m 48.1s on 2013-06-18.73240 UT. The OT unfiltered magnitude is 17.4m (limit 19.4m). The OT is seen in 4 images. There is no minor planet at this place. The object was also present at 17.0m on the images from the same telescope obtained on 2013-06-15.693 and 06-15.723 UT (limit 19.5m). We have reference image without OT on 2012-09-12.57579 UT with unfiltered magnitude limit 19.9m.

The OT is located 6.1" east and 1.6" south of the center of galaxy SDSS J154950.31+605449.7. We suggest that MASTER OT J154951.14+605448.1 is a supernova in this galaxy.

Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/154951.14605448.1.png

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