Table 6.
Spectral analysis conducted on the Swift observations of XTE J1855−026.
| Spectra (model) | Time range (s) | NH | Γ | Ecut | F15 − 50 keV | F0.3 − 10 keV | χ2/d.o.f. |
|---|---|---|---|---|---|---|---|
| since trigger | (1023 cm−2 ) | (keV) | (×10−9) | (×10−10) | Cstat/d.o.f. | ||
| BAT evt (PL) | −239–960 | – | 2.48 ± 0.09 | – | 2.27 ± 0.08 | – | 30.90/24 |
| BAT evt (CPL) | −239–960 | – |
 |
 |
2.31 ± 0.08 | – | 16.63/23 |
| BAT DPH1 (PL) | 1504–1804 | – |
 |
– | 1.88 ± 0.15 | – | 26.08/4 |
| BAT DPH2 (PL) | 1804–2104 | – |
 |
– | 1.32 ± 0.14 | – | 6.81/4 |
| BAT DPH3 (PL) | 2104–2382 | – |
 |
– | 1.49 ± 0.14 | – | 9.98/4 |
| WT1 (PL) | 1510–1627 |
 |
 |
– | – |
 |
279/380 |
| PC1 (PL) | 1629–2376 |
 |
 |
– | – |
 |
260/307 |
| WT2 (PL) | 6788–8160 |
 |
 |
– | – |
 |
240/298 |
| PC2 (PL) | 6795–8154 |
 |
 |
– | – |
 |
162/144 |
| WT3 (PL) | 11708–11740 |
 |
 |
– | – |
 |
62/85 |
| DPH1 + WT1 (CPL) | – | 0.9 ± 0.1 |
 |
10 ± 1 |
 |
 |
355.49/389 |
| DPH2,3 + PC1 (CPL) | – | 0.6 ± 0.2 |
 |
 |
 |
 |
336.19/322 |
| DPH1 + WT1 (CPL+Fe) | – | 0.8 ± 0.1 |
 |
10 ± 1 |
 |
 |
347.62/389 |
| DPH2,3 + PC1 (CPL+Fe) | – | 0.6 ± 0.2 |
 |
 |
 |
≲5.8 | 276.45/322 |
Notes. The power-law model is indicated with PL, the exponential cut-off with CPL. We report the measured value of the absorption column density (NH, in units of 1023 cm−2), the power-law photon index (Γ), the cut-off energy (in keV), and the fluxes in the 15–50 keV energy band from BAT (in units of 10−9 erg cm−2 s−1), and in the 0.3–10 keV energy band from XRT, not corrected for absorption (in units of 10−10 erg cm−2 s−1).
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