![]() Typical nebular lines in AGN spectra from ions such as and are not detected. Optical spectra from Lick and Keck Observatories exhibit strong emission lines with narrow cores from the H Balmer series and ultraviolet semi-forbidden lines of Si iii] λ1892, C iii] λ1909, and C ii] λ2325. The host galaxy is not detected in archival Pan-STARRS observations ( g > 23.3 mag), implying a lower limit to the outburst amplitude of more than 5 mag relative to the quiescent host galaxy. From a spectroscopically measured redshift of 0.995, we estimate a peak observed pseudo-bolometric luminosity of log L max = 45.7 erg s − 1 from slowly fading ztf- g and ztf- r light curves spanning over 1000 observer-frame days. We report multi-wavelength observations and characterization of the ultraluminous transient AT 2021lwx (ZTF20abrbeie aka “Barbie”) identified in the alert stream of the Zwicky Transient Facility (ZTF) using a Recommender Engine For Intelligent Transient Tracking (REFITT) filter on the ANTARES alert broker. Integrative Data Science Initiative, Purdue University, West Lafayette, IN 47907, USAĭepartment of Astronomy, University of California, Berkeley, CA 94720-3411, USAĭepartment of Astronomy and Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721-0065, USAĬenter for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University, Evanston, IL 60202 USAĭepartment of Physics and Astronomy, Northwestern University, Evanston, IL 60208, USA Purdue University, Department of Physics and Astronomy, 525 Northwestern Ave, West Lafayette, IN 47907, USA
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