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Kulkarni (1), D. D. Frederiks (7), D. Hale (6), D. L. Shupe (9), D. S. Svinkin (7) ((1) Caltech, D. Z. J. Dong (1), E. C. Bellm (4), F. Masci (9), G. Helou (9), I. Andreoni (1), K. B. Burdge (1), K. De (1), M. Coughlin (5), M. Feeney (6), M. Graham (1), M. Porter (6), M. T. Soumagnac (13, P. Chandra (3), R. Dekany (6), R. R. Laher (9), V. Z. Golkhou (4","submitted_at":"2020-03-02T22:19:22Z","abstract_excerpt":"We present ZTF18abvkwla (the \"Koala\"), a fast blue optical transient discovered in the Zwicky Transient Facility (ZTF) One-Day Cadence (1DC) Survey. ZTF18abvkwla has a number of features in common with the groundbreaking transient AT2018cow: blue colors at peak ($g-r\\approx-0.5$ mag), a short rise time from half-max of under two days, a decay time to half-max of only three days, a high optical luminosity ($M_{g,\\mathrm{peak}}\\approx-20.6$mag), a hot ($\\gtrsim 40,000$K) featureless spectrum at peak light, and a luminous radio counterpart. 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