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Photometric observations of Gaia17cvx

ATel #11005; Andrew Simon (Taras Shevchenko National University of Kyiv, Ukraine), Yurii Bufan (ICAMER Observatory & Ivan Franko National University of Lviv, Ukraine), Vira Godunova (ICAMER Observatory, Ukraine)
on 24 Nov 2017; 17:49 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Andrew Simon (skazhenijandrew@gmail.com)

Subjects: Optical, Transient

The optical transient Gaia17cvx was discovered by Gaia on 2017-11-11 at magnitude G = 19.28. We confirmed Gaia17cvx with images taken with the 0.6-m Zeiss telescope at the Terskol Observatory on 2017-11-15, just after the alert was published. The source was found to be bright enough that allowed us to perform its differential photometry. The following magnitudes of Gaia17cvx were derived (calibrated against NOMAD field stars; not corrected for the Galactic foreground extinction):

MJD exptime filter mag errstat
58072,6341 600 s B 18,62 0,32
58072,6356 600 s V 17,49 0,10
58072,6367 300 s R 16,72 0,14

Additionally, we estimated an I magnitude of the source against three USNO-B stars; its value of 15.63 ± 0.07 (MJD 58072,6375) suggests Gaia17cvx to be a red object. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).