The soft X-ray transient EP241021A: A cosmic explosion with a complex off-axis jet and cocoon from a massive progenitor

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Volume 703 (November 2025)

A&A, 703 (2025) A92

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Table 2.

Fit results for the broadband light curve.

	Refreshed shocks	Off-axis jet	Cocoon I	Cocoon II
log(E_tot [erg])	48.43^a	51.17 $_{- 0.03}^{+ 0.04}$ $^{+0.04}_{-0.03}$	51.52 $_{- 0.29}^{+ 0.25}$ $^{+0.25}_{-0.29}$	50.93 $_{- 0.09}^{+ 0.06}$ $^{+0.06}_{-0.09}$

log(E₀ [erg])	49.42 $_{- 0.67}^{+ 0.51}$ $^{+0.51}_{-0.67}$	54.50 $_{- 0.03}^{+ 0.04}$ $^{+0.04}_{-0.03}$
log(γ₀)	1.59 $_{- 0.27}^{+ 0.27}$ $^{+0.27}_{-0.27}$
log(ϵ_e)	−0.58 $_{- 0.08}^{+ 0.06}$ $^{+0.06}_{-0.08}$	−0.60 $_{- 0.07}^{+ 0.11}$ $^{+0.11}_{-0.07}$	−1.35 $_{- 0.33}^{+ 0.35}$ $^{+0.35}_{-0.33}$	−0.51 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$
log(ϵ_B)	−1.30 $_{- 0.83}^{+ 0.58}$ $^{+0.58}_{-0.83}$	−1.36 $_{- 0.06}^{+ 0.07}$ $^{+0.07}_{-0.06}$	−0.89 $_{- 0.25}^{+ 0.29}$ $^{+0.29}_{-0.25}$	−0.53 $_{- 0.02}^{+ 0.04}$ $^{+0.04}_{-0.02}$
log(A^∗ [cm⁻¹])	−1.69 $_{- 0.43}^{+ 0.62}$ $^{+0.62}_{-0.43}$	−0.49 $_{- 0.05}^{+ 0.04}$ $^{+0.04}_{-0.05}$
s	2.46 $_{- 0.45}^{+ 0.51}$ $^{+0.51}_{-0.45}$
p	2.0	2.016 $_{- 0.005}^{+ 0.003}$ $^{+0.003}_{-0.005}$	2.02 $_{- 0.02}^{+ 0.01}$ $^{+0.01}_{-0.02}$	2.27 $_{- 0.15}^{+ 0.10}$ $^{+0.10}_{-0.15}$
θ_v		0.108 $_{- 0.004}^{+ 0.002}$ $^{+0.002}_{-0.004}$
u			1.06 $_{- 0.02}^{+ 0.02}$ $^{+0.02}_{-0.02}$	0.34 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$
log(n₀ [cm⁻³])			3.45 $_{- 0.28}^{+ 0.25}$ $^{+0.25}_{-0.28}$	3.90 $_{- 0.10}^{+ 0.10}$ $^{+0.10}_{-0.10}$

Notes. In the first column, we list the parameters for each model: refreshed shock in the jet wings (second column), off-axis top-hat jet core (third column), and two cocoons describing the radio emission at ν < 20 GHz (fourth column) and at ν > 20 GHz (fifth column), respectively. In the second row, E_tot indicates the beaming-corrected energy for the wings refreshed shock and off-axis jet core models, and the total kinetic energy for the two cocoon models.

^(a)

Lower limit assuming a jet opening angle of 25 deg.

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