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 1.

Phenomenological fit of the radio spectra.

	25 d	30 d	48 d	70 d	70 d II
F_b [mJy]	1.6 ± 0.1	2.3 ± 0.1	1.3 ± 0.1	1.1 ± 0.1	$0 . 94_{- 0.08}^{+ 0.05}$ $0.94^{+0.05}_{-0.08}$
log(ν_b [Hz])	9.7 ± 0.1	9.74 $_{- 0.04}^{+ 0.05}$ $^{+0.05}_{-0.04}$	9.6 ± 0.1	9.42 ± 0.03	$10 . 60_{- 0.04}^{+ 0.03}$ $10.60_{-0.04}^{+0.03}$
β₁	2.4 ± 0.4	2.0 ± 0.2	1.5 $_{- 0.7}^{+ 0.4}$ $^{+0.4}_{-0.7}$	2.8 ± 0.2	$2 . 78_{+ 0.31}^{- 0.20}$ $2.78_{+0.31}^{-0.20}$
β₂	−1.2 ± 0.2	$- 1 . 4_{- 0.2}^{+ 0.1}$ $-1.4^{+0.1}_{-0.2}$	$- 0 . 8_{- 0.2}^{+ 0.3}$ $-0.8^{+0.3}_{-0.2}$	−0.9 $_{- 0.2}^{+ 0.1}$ $^{+0.1}_{-0.2}$	$- 1 . 2_{- 0.1}^{+ 0.2}$ $-1.2_{-0.1}^{+0.2}$

Notes. The first column lists the parameters of the fit, the following columns list the mean time at which each spectrum was taken. At 70 d, we find a double-peaked spectrum, and the two components are reported in the last two columns.

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