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Transients Gaia17bdj, Gaia17bdk, and Gaia17bdm confirmed by Euler imaging

ATel #10360; R. I. Anderson (Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, USA), S. Blanco-Cuaresma, L. Palaversa, F. Barblan, S. Saesen, M. Roelens, T. Semaan, N. Mowlavi, L. Eyer (Department of Astronomy, University of Geneva, Switzerland)
on 9 May 2017; 05:11 UT
Credential Certification: Richard I. Anderson (richard.anderson@unige.ch)

Subjects: Optical, Cataclysmic Variable, Microlensing Event, Transient

We report confirmation of Gaia Science Alerts transients Gaia17bdj, Gaia17bdk, and Gaia17bdm. Images were obtained using modified Gunn R-band and Geneva V-band filters on the ECAM instrument installed on the Swiss 1.2m Euler telescope at La Silla Observatory, Chile, on 2017 May 03 between 8 and 9 UT, and on 2017 May 05 between 4 and 5 UT.

Gaia15bdj is a candidate CV (brightened by 4 mag) with alternative ID ASASSN-15Ic and is seen as a faint source in an archival DSS image.

Gaia15bdk is a candidate microlensing event in the Galactic bulge that has brightened by nearly 2 magnitudes and is now rapidly declining in brightness.

Gaia15bdm is a candidate CV with no host apparent in archival DSS images and alternative ID SSS120620:1751-605942.

400x400 pixel cut out images in ECAM modified Gunn R band are available via the links above (N is up, E is left and the scale is 0.215"/pix). The below table provides heliocentric Julian Date - 2,400,000d and magnitudes.

57876.84 -->
Source HJD - 2400000 R-band [mag] V-band [mag]
Gaia15bdj 57876.85 16.69 16.57
Gaia15bdj 57878.70 17.65 --
Gaia17bdk 57876.86 16.58 --
Gaia17bdm 57876.83 18.5818.40
Gaia17bdm 57878.69 18.92 --

The photometric calibrations was performed using the Cambridge Photometric Calibration Server (CPCS), designed and maintained by Sergey Koposov and Lukasz Wyrzykowski. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (https://gaia.ac.uk/selected-gaia-science-alerts).