Off-axis cocoon emission from long GRB jets produces fast X-ray transients with luminosities of 10^47-48 erg/s, durations of 10-100 s, and soft quasi-thermal spectra peaking near 0.8 keV.
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EP250827b/SN 2025wkm is an X-ray flash supernova at z=0.1194 powered by a long-lived magnetar and disk winds interacting with extended circumstellar medium, without an on-axis relativistic jet.
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Fast X-ray Transients produced by Off-axis Jet-Cocoons from Long Gamma-Ray Bursts
Off-axis cocoon emission from long GRB jets produces fast X-ray transients with luminosities of 10^47-48 erg/s, durations of 10-100 s, and soft quasi-thermal spectra peaking near 0.8 keV.
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EP250827b/SN 2025wkm: An X-ray Flash-Supernova Powered by a Central Engine and Circumstellar Interaction
EP250827b/SN 2025wkm is an X-ray flash supernova at z=0.1194 powered by a long-lived magnetar and disk winds interacting with extended circumstellar medium, without an on-axis relativistic jet.