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Table 5

Best-fit parameters of the RXTE spectra of Swift J1644+57 and Swift J2058+05.

Source Number of set α = Γ−1 kTs (eV) log (A) N a Ecut (keV) kTe (keV) (d.o.f.)
Sw J1644 R1b ................ 0.76 ± 0.01 90d 0.5 ± 0.3 1.1 ± 0.1 90 ± 4 ..... 0.90 (74)
R2b ................ 0.73 ± 0.02 90d –0.26 ± 0.08 0.6 ± 0.2 100 ± 7 ..... 0.95 (74)
R3b ................ 0.78 ± 0.04 90d –0.3 ± 0.1 0.5 ± 0.1 110 ± 8 ..... 0.95 (74)
R1+Sz1c ....... 0.79 ± 0.05 370 ± 10 –0.43 ± 0.04 0.4 ± 0.1 ..... 34 ± 2 1.03 (899)
Sw J2058 R4b ................ 0.6 ± 0.1 160d 0.3 ± 0.1 3.4 ± 0.5 16 ± 4 ..... 0.93 (125)
R4+Sw6c ....... 0.45 ± 0.06 210 ± 30 –0.43 ± 0.04 3.8 ± 0.3 ..... 4.0 ± 0.8 1.02 (1094)

Notes. Errors are given at the 90% confidence level.

(a)

The normalization parameters of the BMC and COMPTB components are in units of erg s-1 kpc-2, where is the soft photon luminosity in units of 1036 erg s-1, d10 is the distance to the source in units of 10 kpc. NH,Gal, the Galactic column density for the neutral absorber, was fixed to 2 × 1020 cm-2 (for Sw J1644+57) and 6.5 × 1020 cm-2 (for Sw J2058+05; Kalberla et al. 2005) and NH,z = 0.354/NH,z = 1.1853, the column density for the neutral absorber in the local frame at redshift z = 0.354/z = 1.1853, was fixed to 1.5 × 1022 cm-2 (for Sw J1644+57; Saxton et al. 2012) and 2.6 × 1021 cm-2 (for Sw J2058+05; Cenko et al. 2012), respectively; kTs is the seed photon temperature, kTe is the electron temperature, and Ecut is the cutoff energy.

(b)

Spectrum was fitted by the phabs*zphabs*bmcz*zhighect model;

(c)

spectrum was fitted by the phabs*zphabs*CompTBz model;

(d)

indicates that a parameter was fixed.

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