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In the last decade a number of rapidly evolving transients have beendiscovered that are not easily explained by traditional supernovae models. Wepresent optical and UV data on onee such object, SN 2018gep, that displayed afast rise with a mostly featureless blue continuum around maximum light, andevolved to develop broad features more typical of a SN Ic-bl while retainingsignificant amounts of blue flux throughout its observations. The blue excessis most evident in its near-UV flux that is over 4 magnitudes brighter thanother stripped envelope supernovae, but also visible in optical g$-$r colors atearly times. Its fast rise time of $t_{\rm rise,V} \lesssim 6.2 \pm 0.8$ daysputs it squarely in the emerging class of Fast Evolving Luminous Transients, orFast Blue Optical Transients. With a peak absolute magnitude of M$_r=-19.49 \pm0.23 $ mag it is on the extreme end of both the rise time and peak magnitudedistribution for SNe Ic-bl. Only one other SN Ic-bl has similar properties,iPTF16asu, for which less of the important early time and UV data have beenobtained. We show that the objects SNe 2018gep and iPTF16asu have similarphotometric and spectroscopic properties and that they overall share manysimilarities with both SNe Ic-bl and Fast Evolving Transients. We obtain IFUobservations of the SN 2018gep host galaxy and derive a number of propertiesfor it. We show that the derived host galaxy properties for both SN 2018gep andiPTF16asu are overall consistent with the SNe Ic-bl and GRB/SNe sample whilebeing on the extreme edge of the observed Fast Evolving Transient sample. Thesephotometric observations are consistent with a simple SN Ic-bl model that hasan additional form of energy injection at early times that drives the observedrapid, blue rise, and we speculate that this additional power source mayextrapolate to the broader Fast Evolving Transient sample.

The Exotic Type Ic Broad-Lined Supernova SN 2018gep: Blurring the Line Between Supernovae and Fast Optical Transients