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Table 2.

Spectral fit results for the eROSITA and Swift/XRT observations of J012026.

Epoch Spectrum Best model kT [eV] Γ F 0.2 − 2.3 keV disk $ F^{\mathrm{disk}}_{\mathrm{0.2-2.3\,keV}} $ [erg s−1 cm−2] F 0.2 − 2.3 keV p -law $ F^{p\text{-law}}_{\mathrm{0.2-2.3\,keV}} $ [erg s−1 cm−2] Δlog Z
eRASS2 Full power-law 90 ± 10 4 . 35 − 0.30 + 0.34 $ 4.35^{+0.34}_{-0.30} $ 9 . 3 − 1.4 + 1.6 × 10 − 13 $ 9.3^{+1.6}_{-1.4} \times 10^{-13} $ 1 . 14 − 0.18 + 0.15 × 10 − 12 $ 1.14^{+0.15}_{-0.18} \times 10^{-12} $ 4
eRASS3 Full – 80 − 10 + 20 $ 80^{+20}_{-10} $ 4.79 ± 0.64 2 . 4 − 0.7 + 0.9 × 10 − 13 $ 2.4^{+0.9}_{-0.7} \times 10^{-13} $ 2 . 9 − 0.9 + 1.0 × 10 − 13 $ 2.9^{+1.0}_{-0.9} \times 10^{-13} $ 0
Baseline – 80 ± 10 5 . 20 − 0.57 + 0.5 $ 5.20^{+0.5}_{-0.57} $ 4 . 3 − 1.6 + 2.5 × 10 − 14 $ 4.3^{+2.5}_{-1.6} \times 10^{-14} $ 4 . 5 − 1.3 + 2.5 × 10 − 14 $ 4.5^{+2.5}_{-1.3} \times 10^{-14} $ 0
Flare power-law 90 ± 10 4 . 29 − 0.95 + 0.96 $ 4.29^{+0.96}_{-0.95} $ 1 . 17 − 0.47 + 0.61 × 10 − 12 $ 1.17^{+0.61}_{-0.47} \times 10^{-12} $ 1 . 70 − 0.72 + 1.02 × 10 − 12 $ 1.70^{+1.02}_{-0.72} \times 10^{-12} $ 2
Swift/XRT3 Full power-law 170 − 12 + 20 $ 170^{+20}_{-12} $ 3.66 ± 0.31 1 . 4 − 0.3 + 0.4 × 10 − 12 $ 1.4^{+0.4}_{-0.3} \times 10^{-12} $ 2.3 ± 0.5 × 10−12 0
Swift/XRT4 Full power-law 190 − 32 + 39 $ 190^{+39}_{-32} $ 3 . 53 − 0.46 + 0.47 $ 3.53^{+0.47}_{-0.46} $ 6 . 9 − 1.6 + 2.1 × 10 − 13 $ 6.9^{+2.1}_{-1.6} \times 10^{-13} $ 1 . 4 − 0.3 + 0.2 × 10 − 12 $ 1.4^{+0.2}_{-0.3} \times 10^{-12} $ 4
eRASS4 Full – – 2 . 07 − 0.68 + 0.64 $ 2.07^{+0.64}_{-0.68} $ – 9 . 7 − 0.4 + 0.3 × 10 − 14 $ 9.7^{+0.3}_{-0.4} \times 10^{-14} $ –
eRASS5 Full – 100 ± 10 4 . 21 − 0.27 + 0.31 $ 4.21^{+0.31}_{-0.27} $ (8.1 ± 1.1)×10−13 1 . 02 − 0.14 + 0.18 × 10 − 12 $ 1.02^{+0.18}_{-0.14} \times 10^{-12} $ 0
Baseline – 70 ± 10 5 . 28 − 0.57 + 0.48 $ 5.28^{+0.48}_{-0.57} $ 5 . 8 − 1.6 + 1.9 × 10 − 13 $ 5.8^{+1.9}_{-1.6} \times 10^{-13} $ 7 . 8 − 2.4 + 2.7 × 10 − 13 $ 7.8^{+2.7}_{-2.4} \times 10^{-13} $ 0
Flare – 120 ± 20 3.97 ± 0.48 1 . 45 − 0.33 + 0.43 × 10 − 12 $ 1.45^{+0.43}_{-0.33} \times 10^{-12} $ 2 . 08 − 0.65 + 0.55 × 10 − 12 $ 2.08^{+0.55}_{-0.65} \times 10^{-12} $ 0

Notes. In the second column, we indicate whether the results correspond to the full spectrum, the flaring eROdays only, or the remaining baseline eROdays. Based on the difference in Bayesian evidence (last column), we indicate which of the two models is preferred in the third column. We report both the DISKBB temperature kT and the photon index Γ for all spectra in Cols. 4 and 5, as well as the 0.2–2.3 keV flux derived for each model respectively in Cols. 6 and 7.

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