Outburst in CV candidate Gaia17cuh
ATel #12238; A. Simon (National Taras Shevchenko University of Kyiv, Ukraine), V. Godunova (ICAMER Observatory, Ukraine), I. Izviekova (ICAMER Observatory, Ukraine), V. Kozlov (ICAMER Observatory, Ukraine), V. Vasylenko (National Taras Shevchenko University of Kyiv, Ukraine)
on 24 Nov 2018; 00:47 UT
Credential Certification: Andrew Simon (skazhenijandrew@gmail.com)
Subjects: Optical, Cataclysmic Variable, Variables
The bright blue transient Gaia17cuh/AT2017hwz on faint red Gaia source near Galactic plane was triggered on 2017-11-02 when it brightened by more than 3 mags and reached a G magnitude of 15.48. We observed this object on 2017-11-18 with the 2-m RCC telescope at the Terskol Observatory and found it to be faded (ATel #11006). Further observations of this source by Gaia revealed in May 2018 a repeated increase in its brightness that allowed us to calculate a next date this candidate CV to be appeared brighter. To prove this assumption, early November 2018 we restarted to observe Gaia17cuh using the 60-cm telescope at the Terskol Observatory (the North Caucasus) and the 70-cm telescope at the Lisnyky Observatory (near Kyiv).
The data acquired, especially R-band observations, indicated that the object's brightness was continuously increasing from 2018-11-11. Amplitude of the outburst is more than 3 mags. On 2018-11-22 we detected small variations in R-band with amplitude of about 0.1 mag ( Fig.1). The light curve plotted with the aid of Cambridge Photometry Calibration Server (CPCS) is shown on the Fig.2. Further observations are encouraged.
We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).
