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We present the discovery of ASASSN-18jd (AT 2018bcb), a luminousoptical/UV/X-ray transient located in the nucleus of the galaxy 2MASXJ22434289--1659083 at $z=0.1192$. Over the year after discovery, Swift UVOTphotometry shows the UV SED of the transient to be well modeled by a slowlyshrinking blackbody with temperature $T \sim 2.5 \times 10^{4} \rm ~K$, amaximum observed luminosity of $L_\text{max} = 4.5^{+0.6}_{-0.3} \times 10^{44}\rm ~erg ~s^{-1}$, and a radiated energy of $E = 9.6^{+1.1}_{-0.6} \times10^{51} \rm ~erg$. X-ray data from Swift XRT and XMM-Newton show a transient,variable X-ray flux with blackbody and power-law components that fade by nearlyan order of magnitude over the following year. Optical spectra show strong,roughly constant broad Balmer emission as well as transient featuresattributable to He II, N III-V, O III, and coronal Fe. While ASASSN-18jd sharessimilarities with Tidal Disruption Events (TDEs), it is also similar to thenewly-discovered nuclear transients seen in quiescent galaxies and faint ActiveGalactic Nuclei (AGNs).

To TDE or not to TDE: The luminous transient ASASSN-18jd with TDE-like and AGN-like qualities