EP260321a is a thermal soft X-ray shock breakout from a ~300 R_⊙ CSM shell around a stripped-envelope progenitor, followed by SN Ic-BL 2026gzf.
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X-rays breaking out of pre-explosion ejecta mark a supernova's first light
EP260321a is a thermal soft X-ray shock breakout from a ~300 R_⊙ CSM shell around a stripped-envelope progenitor, followed by SN Ic-BL 2026gzf.