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MASTER: possible superluminous SN in SDSS galaxy

ATel #8104; V. Shumkov, V. Lipunov, E. Gorbovskoy, V. Kornilov, N. Tiurina, P. Balanutsa, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Vladimirov, V. Chazov, E. Popova (M. V.Lomonosov Moscow State University, SAI), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), O. Gress, N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), V. Krushinskiy (Ural Federal University)
on 30 Sep 2015; 12:28 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Supernovae, Transient

Referred to by ATel #: 8110, 8115

MASTER OT J173142.37+435334.1 discovery - possible superluminous SN(17.3m) in SDSS J173142.34+435333.2 galaxy (g_mag=20.7)

MASTER-Kislovodsk auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 31m 42.37s +43d 53m 34.1s on 2015-09-29.68178 UT.
The OT unfiltered magnitude is 17.3m (the limit is 19.0m).
This PSN is in 0.93" from the SDSS J173142.34+435333.2 galaxy with gmag=20.7 and is seen in 5 images.
We have reference image without OT on 2012-07-11.83875 UT with unfiltered magnitude limit 19.8m.
There is no minor planet at this place.
Spectral observations are required.
The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ173142.37435334.1.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net