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Swift-XRT spectra of GRB 110731A

Last updated after receiving ObsID 00458448015, version 9

Data were analysed using HEASOFT version 6.29

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The spectral fits assume a redshift: 2.83 (GCN 12225)

Jump to: Time-averaged|Late Time


Time-averaged spectrum (T0 + 72 to 36083 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+246 s

NH (Galactic)1.65 × 1021 cm-2
NH (intrinsic)4.4 (+3.1, -3.0) × 1021 cm-2
z of absorber2.83
Photon index1.88 (+0.04, -0.04)
Flux (0.3-10 keV)
(Observed)
6.91 (+0.18, -0.17) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
8.90 (+0.18, -0.18) × 10-10 erg cm-2 s-1
Counts to flux (obs)3.67 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.73 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
687.75 (676)
Spectrum exposure573 s

PC mode. Mean photon arrival: T0+8366 s

NH (Galactic)1.65 × 1021 cm-2
NH (intrinsic)3 (+8, -3) × 1021 cm-2
z of absorber2.83
Photon index1.76 (+0.10, -0.09)
Flux (0.3-10 keV)
(Observed)
1.65 (+0.11, -0.11) × 10-11 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.04 (+0.11, -0.10) × 10-11 erg cm-2 s-1
Counts to flux (obs)3.99 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.92 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
392.50 (435)
Spectrum exposure7.5 ks

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Late Time spectrum (T0 + 6053 to 36083 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+16008 s

NH (Galactic)1.65 × 1021 cm-2
NH (intrinsic)5.2 (+13.1, -5.2) × 1021 cm-2
z of absorber2.83
Photon index1.78 (+0.15, -0.13)
Flux (0.3-10 keV)
(Observed)
6.1 (+0.6, -0.6) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
7.6 (+0.6, -0.5) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.96 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.94 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
274.63 (315)
Spectrum exposure6.8 ks

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