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MASTER-IAC: first optical transient discovery

ATel #7651; V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra-Ricart (IAC), O. Gress (ISU), E. Gorbovskoy (MSU), N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), V. Kornilov, N. Tiurina, P. Balanutsa, V. Chazov (Lomonosov Moscow State University, Sternberg Astronomical Institute), N. Budnev, K. Ivanov (Applied Physics Institute of Irkutsk State University), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of of the Pulkovo observatory RAS), V. Krushinsky (Ural Federal University), D. Buckley, S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University)
on 17 Jun 2015; 15:56 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT J205803.49+084458.7 - first OT discovered at MASTER-IAC, Dwarf Nova outburst with Ampl>3.5

MASTER-IAC was installed at the Observatorio del Teide (Tenerife) at the end of May 2015

MASTER-IAC auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered optical transient at (RA, Dec) = 20h 58m 03.49s +08d 44m 58.7s on 2015-06-13.134 UT.

The OT unfiltered magnitude is 17.8m (the limit is 19.5m). There is no minor planet at this place.

There are reference images without OT in MASTER-Net database
on 2010-08-28.768UT with unfiltered m_lim=19.6 and 2012-06-21.961 with m_lim=19.5 (MASTER-Kislovodsk),
on 2012-09-12.844UT with unfiltered m_lim=19.6 (MASTER-Tunka),
on 2011-09-21.659UT with m_lim=19.2 (MASTER-Ural).

There is only SDSS J205803.51+084458 star with Rmag=21.345. So we can suggest the dwarf nova outburst with amplitude more then 3.5m.
Preliminary MASTER OT J205803.49+084458.7 photometry is the following:
UT, unfiltered m_OT 2015-06-13.1338 17.8
2015-06-15.0754 17.8
2015-06-16.2087 18.0

The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ205803.49+084458.7.jpg

Spectral observations are required.

We devoted this discovery to the 30th Anniversary of the Observatorios de Canarias.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net