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MASTER-IAC: dwarf nova outburst

ATel #8001; S. Shurpakov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), V. Kornilov, N. Tiurina, A. Kuznetsov, P. Balanutsa, I. Gorbunov (Lomonosov Moscow State University, Sternberg Astronomical Institute), 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 5 Sep 2015; 06:43 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J235632.99+391949.0 discovery - dwarf nova outburst, Ampl>4m , only GSC2.3 star with 21.84(blue)

MASTER-IAC auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 )discovered OT source at (RA, Dec) = 23h 56m 32.99s +39d 19m 49.0s on 2015-09-04.21970 UT.

The OT unfiltered magnitude is 17.6m (the limit is 19.2m).

The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2012-09-16 22:26:40 UT with 20.0 unfiltered magnitude limit in MASTER-Kislovodsk database. There are 2 images with this OT in MASTER-Kislovodsk on 2015-08-28 21:17:08 and 2015-08-29 21:20:11 with unfiltered m_OT=17.3. There are 300 images in MASTER-IAC, -Kislovodsk, -Tunka, -Amur database without any source at this area from 2010-06-01 23:52:23 up to unfiltered 20.0m. There is only GSC2.3 star with blue j=21.84 in VIZIER database. So we can suggest the dwarf nova outbursts with amplitude more then 4m.

Spectral observations are required.

The discovery and reference images are available at http://observ.pereplet.ru/images/MASTEROTJ235632.99+391949.0.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net