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Optical follow-up of the Gaia19btn

ZTF19aaumtxz/Gaia19btn/AT2019fdawas discovered on 2019-05-09 by J. Nordin, V. Brinnel, M. Giomi, J. van Santen (HU Berlin), A. Gal-Yam, O. Yaron, S. Schulze (Weizmann) on behalf of ZTF team at magnitude r-ZTF = 15.43 and rediscovered on 2019-05-12 by A. Delgado, D. Harrison, S. Hodgkin, M. van Leeuwen, G. Rixon, A. Yoldas (University of Cambridge), on behalf of Gaia Alerts team.

First follow-up observations were provided by Crimean Astrophysical observatory on 2019-05-15 and by Lisnyky Observatory on 2019-05-17. Results were published in The Astronomer's Telegram .

Superhumps in the light curve of Gaia19btn as observed on 2019-05-15 at the Crimean Astrophysical Observatory.