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Photometry of transients Gaia17dce and Gaia17dcv

ATel #11044; A. Simon, V. Reshetnyk (Astronomy and Space Physics Department, National Taras Shevchenko University of Kyiv, Ukraine), I. Sokolov (INASAN RAN), V. Godunova (ICAMER Observatory, Ukraine)
on 9 Dec 2017; 07:15 UT
Credential Certification: Andrew Simon (skazhenijandrew@gmail.com)

Subjects: Optical, Transient

Referred to by ATel #: 11123

We report BVR photometry of transients Gaia17dce and Gaia17dcv performed with the 2-m RCC telescope at the Terskol Observatory.

The bright blue hostless transient Gaia17dce was discovered by Gaia on 2017-11-27 at magnitude G = 16.67. There was no progenitor object on archival images. We detected Gaia17dce on the images taken on 2017-12-01 (MJD 58088.71). Using the AAVSO catalogue for photometric calibration we obtained the following magnitudes of the source (not corrected for the Galactic foreground extinction): B = 17.41 ± 0.07, V = 17.12 ± 0.08, R = 17.13 ± 0.05.

The blue transient Gaia17dcv was detected near the galaxy APMUKS (BJ) B005538.52-120314.2 on 2017-11-30 at magnitude G = 18.93. Follow-up observations of this object started at Terskol on 2017-12-01, just after the alert was published. CCD images were calibrated using NOMAD field stars. The following magnitudes of Gaia17dcv were derived (not corrected for the Galactic foreground extinction):

Filter MJD mag errstat MJD mag errstat
B 58088.757 18.37 0.06 58089.828 18.77 0.20
V 58088.756 18.74 0.05 58089.829 18.73 0.14
R 58088.755 18.85 0.03 58089.831 18.99 0.11

We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).