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Swift-XRT spectra of GRB 091221

Last updated after receiving ObsID 00380311006, version 9

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time


Time-averaged spectrum (T0 + 78 to 11601 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+116 s

NH (Galactic)1.86 × 1021 cm-2
NH (intrinsic)3.1 (+0.7, -0.6) × 1021 cm-2
z of absorber0
Photon index2.33 (+0.13, -0.13)
Flux (0.3-10 keV)
(Observed)
7.0 (+0.4, -0.4) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.42 (+0.16, -0.12) × 10-9 erg cm-2 s-1
Counts to flux (obs)3.33 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)6.76 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
411.52 (444)
Spectrum exposure95 s

PC mode. Mean photon arrival: T0+4845 s

NH (Galactic)1.86 × 1021 cm-2
NH (intrinsic)3.1 (+14.6, -3.1) × 1020 cm-2
z of absorber0
Photon index1.60 (+0.30, -0.23)
Flux (0.3-10 keV)
(Observed)
3.1 (+0.6, -0.5) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
3.7 (+0.6, -0.5) × 10-12 erg cm-2 s-1
Counts to flux (obs)4.51 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)5.44 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
111.37 (165)
Spectrum exposure4.3 ks

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Late Time spectrum (T0 + 4000 to 11601 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+6507 s

NH (Galactic)1.86 × 1021 cm-2
NH (intrinsic)1.4 (+2.6, -1.4) × 1021 cm-2
z of absorber0
Photon index1.6 (+0.4, -0.4)
Flux (0.3-10 keV)
(Observed)
2.2 (+0.6, -0.5) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.7 (+0.6, -0.4) × 10-12 erg cm-2 s-1
Counts to flux (obs)4.89 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)6.07 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
79.78 (114)
Spectrum exposure3.7 ks

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