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Optical follow-up observations of MASTER OT105123.02+672528.3

ATel #3849; K. V. Sokolovsky, K. O. Baryshev, S. A. Korotkiy
on 6 Jan 2012; 23:59 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)

Subjects: Optical, Cataclysmic Variable

Referred to by ATel #: 3889

The optical transient MASTER OT105123.02+672528.3 (ATel #3845) was observed on 2012 January 6 from the Mountain station of Kazan State University (Karachay-Cherkessia, Russia) using a 80mm f/7.5 refractor telescope equipped with an unfiltered ST-8300M CCD camera.

The transient source was detected at position 10:51:22.86 +67:25:28.2 (+/-0.3", J2000) measured with respect to nearby UCAC3 stars (Zacharias et al. 2010, AJ, 139, 2184) at unfiltered magnitude 15.08 (JD2455933.325). The magnitude zero-point was set using red magnitudes of USNO-B1.0 (Monet et al. 2003, AJ, 125, 984) stars in the field of view. No variability greater than 0.06m was detected within the 3.5h observing run.

We note that MASTER OT105123.02+672528.3 is likely associated with an unidentified X-ray source 1RXS J105120.5+672550 from the ROSAT All-Sky Survey Faint Source Catalogue (Voges et al., 2000, IAUC, 7432) while there is no known radio source that could be associated with it. The hardness ratios listed in the ROSAT catalog do not contradict the hypothesis of this object being a cataclysmic variable.