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Table 1

Parameters of power-law or log-parabolic fits to all four Swift-XRT observations, as well as the summed spectrum.

ObsID Start time Exposure ΓX or a b K (n.d.f.) F-test F 0.3 − 10 keV
MJD-55000 [s] [10-3 cm-2 s-1 keV-1] [10-11 erg cm-2 s-1]

00031806002 449.05 3783 1.95 ± 0.06 2.62 ± 0.09 1.15(55) 4 × 10-2 1.28 ± 0.06
00031806003 449.98 4190 2.03 ± 0.04 2.46 ± 0.07 1.28(61) 1.38 ± 0.04
00031806004 451.05 3848 1.98 ± 0.05 2.46 ± 0.09 0.98(52) 5 × 10-2 1.30 ± 0.08
00031806005 451.58 2745 2.02 ± 0.05 2.38 ± 0.08 0.80(39) 1.33 ± 0.09
sum 14 566 2.00 ± 0.03 0.23 ± 0.06 2.73 ± 0.05 1.15(178) 5 × 10-4 1.36 ± 0.03

Notes.Column 4 gives either the power-law index ΓX or the log-parabola value of a depending on which model best fits the data. Column 7 shows the reduced χ2 value , Col. 8 the F-test probability for the log-parabolic model when it is preferred over the power law, and Col. 9 the estimation for the unabsorbed flux (using cflux) in the 0.3 − 10 keV range. The values of b and F-test are not provided when the log-parabola is not preferred.

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