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Swift-XRT spectra of GRB 121229A

Last updated after receiving ObsID 00544347003, version 8.

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The spectral fits assume a redshift: 2.707 (GCN 14120)

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Time-averaged spectrum (T0 + 0 to 75012 s)

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WT and PC mode spectra of GRB 121229A

WT mode. Mean photon arrival: T0+422 s

NH (Galactic)2.08 × 1021 cm-2
NH (intrinsic)7 (+4, -4) × 1021 cm-2
z of absorber2.707
Photon index2.04 (+0.05, -0.05)
Flux (0.3-10 keV)
(Observed)
7.47 (+0.22, -0.22) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.074 (+0.032, -0.028) × 10-9 erg cm-2 s-1
Counts to flux (obs)3.46 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.98 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
594.09 (621)
Spectrum exposure371 s

PC mode. Mean photon arrival: T0+14893 s

NH (Galactic)2.08 × 1021 cm-2
NH (intrinsic)0 (+8.23 × 1021, -0) cm-2
z of absorber2.707
Photon index2.20 (+0.21, -0.18)
Flux (0.3-10 keV)
(Observed)
8.6 (+1.0, -1.2) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.19 (+0.17, -0.19) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.19 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.39 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
135.79 (172)
Spectrum exposure14.6 ks

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Late Time spectrum (T0 + 4000 to 75012 s)

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PC mode spectrum of GRB 121229A

PC mode. Mean photon arrival: T0+34784 s

NH (Galactic)2.08 × 1021 cm-2
NH (intrinsic)0 (+3.29 × 1022, -0) cm-2
z of absorber2.707
Photon index1.96 (+0.42, -0.28)
Flux (0.3-10 keV)
(Observed)
3.3 (+0.9, -0.7) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
4.4 (+0.9, -0.8) × 10-13 erg cm-2 s-1
Counts to flux (obs)3.65 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.96 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
81.86 (86)
Spectrum exposure14.4 ks

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