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Blue object with fast variability, detected by MASTER

ATel #8366; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo Lopez, M. Serra-Ricart, G. Israelyan, N. Lodieu ( Instituto de Astrofisica de Canarias), N. Samus (INASAN, SAI MSU), N. Tiurina, V. Kornilov, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Vladimirov, E. Popova (M. V. Lomonosov Moscow State University, SAI), O. Gress, N. Budnev, K. Ivanov (API, ISU)
on 4 Dec 2015; 21:52 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Transient, Variables

MASTER OT J234158.45+351455.2 discovery - B~R~I,+ ultraviolet, + fast variability (the outburst in 1.2mag during 8 min). Close binary system with accreting white dwarf. The Spectrum is very required

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 23h 41m 58.45s +35d 14m 55.2s on 2015-12-02 22:53:42 UT with unfiltered magnitude m_OT=17.8m (the limit is 20.3m, exposition is 180s). There are m_OT=19.0 on 2015-12-02 23:04:44 and n_OT=19.0 on 2015-12-02 22:42:28UT.

The OT is seen in 3 images. There is no minor planet at this place. We have reference image with unfiltered m_OT=19.2 on 2015-07-21.11885 UT (MASTER-IAC, m_lim=19.7),

MASTER-Tunka archive and today photometry.
Date, UT                    Unfiltered m_OT
2011-11-03 13:28:06.502     18.0
2011-11-03 14:06:08.475     18.3
2011-11-05 13:39:34.614     18.7
2011-11-05 13:54:27.496     19.0
2012-01-31 12:11:33.593     18.8
2012-11-15 12:45:29.824     19.0
2013-07-09 16:48:21.496     19.0
2013-12-21 11:23:28.287     17.9
2013-12-21 11:25:05.763     18.5
2015-02-09 11:28:52.156     18.8
2015-10-08 14:16:11.179     19.2
2015-12-04 13:26:39.075     19.5
.........60 images without variability....
2015-12-04 16:53:47.27     19.3

There is a blue source with B1=18.85, R2=18.88, I=18.83, with GALEX source and ALLWISE source (W1,2,3,4) in VIZIER database. There are very different estimations of PM (0 in NOMAD, several mas/yr in GAIA, several thousands mas/y in AlLWISE). There are 2 CRTS previous outbursts with the same ampl in its history of observations.

Spectral observations are required.

Fast variability very requires a Spectrum. MASTER can suggest the close binary system with accreting white dwarf.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/234158.45351455.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net