NEXUS: Discovery of a Luminous Young Transient at $z=5$
Astronomers report the discovery of AT 2026abck, a young transient at z=5.017 found in JWST NEXUS Year-2 imaging — the first robustly detected z≳5 transient in a non-lensing field. Its hot, luminous, UV-bright emission and off-nucleus location point to a core-collapse supernova caught roughly 4–10 rest-frame days after explosion.
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