The X-ray burst EP260321a is best explained as a supernova shock breaking out of a dense wind, implying fast outer ejecta (≈3.5×10^49 erg) and a ≈10^-5 solar-mass circumstellar cloud.
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Shock breakout from mildly relativistic ejecta in a dense wind: the case of EP260321a/SN~2026gzf
The X-ray burst EP260321a is best explained as a supernova shock breaking out of a dense wind, implying fast outer ejecta (≈3.5×10^49 erg) and a ≈10^-5 solar-mass circumstellar cloud.