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Possible Supernova and New Flare of an Old OT detected by MASTER

ATel #6587; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk Solar Station of Pulkovo Observatory), V. Yurkov, A. Gabovich, Y. Sergienko, E. Sinyakov (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Shumkov, S. Shurpakov (MASTER team members)
on 17 Oct 2014; 08:25 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient

Referred to by ATel #: 6595

MASTER OT J095321.02+202721.2 - PSN

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 00h 09m 17.60s +30d 22m 30.1s on 2014-10-15.85795 UT. The OT unfiltered magnitude is 18.9m (limit 19.9m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2014-09-21.99400 UT with unfiltered magnitude limit 20.3m.

The OT is located 20" east and 19" south of the center of the galaxy PGC 1901469 = SDSS J000916.03+302249.1 (g=16.94 r=15.94 i=15.47) with unknown redshift. There is nothing at the position of the OT on SDSS images to the limiting magnitude ~23.5.

Spectral confirmation is required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/000917.60302230.1.png

New flare of MASTER OT J200455.61+440220.4

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 20h 04m 55.55s +44d 02m 19.2s on 2014-10-14.52505 UT. The OT unfiltered magnitude is 17.2m (limit 18.7m). The OT is seen in 10 images brightening to 16.8m. There is no minor planet at this place. We have reference image without OT on 2011-08-01.72633 UT with unfiltered magnitude limit 19.2m.

The object is identical to MASTER OT J200455.61+440220.4 discovered on 2012-10-30 (P. Balanutsa et al., ATel #4549). It is listed in AAVSO VSX as a possible dwarf nova (UG:). The current outburst confirms the proposed classification. Follow up observations are encouraged. The detection and reference images by MASTER-Tunka are available at: http://master.sai.msu.ru/static/OT/200455.55440219.2.png

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net