MASTER-IAC: possible superluminous SN in SDSS galaxy

ATel #8064; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), N. Tyurina, V. Kornilov, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Chazov (M. V. Lomonosov Moscow State University, SAI), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), O. Gress, N. M. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinski, I. Zalozhnykh (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 17 Sep 2015; 21:29 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J183934.91+414404.2 discovery - PSN in 0.8" from SDSSJ183934.84+414404.5 galaxy

MASTER-IAC auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 18h 39m 34.91s +41d 44m 04.2s on 2015-09-16.89003 UT.
The OT unfiltered magnitude is 17.2m (limit 19.5m).
The OT is seen in 3 images. There is no minor planet at this place. We have reference images without OT in the following MASTER databases with unfiltered magnitude limit :
Date,UT unfiltered m_lim MASTER observatory
2015-06-25.89529 18.9m MASTER-IAC
2015-08-08 16:37:03 19.2 MASTER-Tun
2014-07-28 16:51:29 19.5 MASTER-Tun
2014-03-25 01:17:52 19.7 MASTER-Kis
2013-06-08 20:05:17 19.0 MASTER-Kis
2013-04-04 17:42:24 19.4 MASTER-Tun
2012-07-27 14:15:34 19.0 MASTER-Amu
2012-04-30 22:48:38 19.9 MASTER-Kis

This PSN is in 0.8" from the center of SDSSJ183934.84+414404.5 galaxy
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ183934.91414404.2.png

MASTER Global Robotic Net