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Swift-XRT spectra of GRB 091221

Last updated after receiving ObsID 00380311006, version 8.

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

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WT and PC mode spectra of GRB 091221

WT mode. Mean photon arrival: T0+116 s

NH (Galactic)1.1 × 1021 cm-2
NH (intrinsic)3.10 (+0.46, -0.44) × 1021 cm-2
z of absorber0
Photon index2.50 (+0.14, -0.13)
Flux (0.3-10 keV)
(Observed)
6.87 (+0.42, -0.39) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.719 (+0.097, -0.055) × 10-9 erg cm-2 s-1
Counts to flux (obs)3.3 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)8.3 × 10-11 erg cm-2 ct-1
C-stat (dof)397.39 (449)
Exposure time95 s

PC mode. Mean photon arrival: T0+4604 s

NH (Galactic)1.1 × 1021 cm-2
NH (intrinsic)9.0 (+11.7, -9.0) × 1020 cm-2
z of absorber0
Photon index1.71 (+0.32, -0.30)
Flux (0.3-10 keV)
(Observed)
3.03 (+0.61, -0.50) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
3.91 (+0.60, -0.49) × 10-12 erg cm-2 s-1
Counts to flux (obs)4.6 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)5.9 × 10-11 erg cm-2 ct-1
C-stat (dof)126.92 (161)
Exposure time4.3 ks

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Late Time spectrum (T0 + 4000 to 11601 s)

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PC mode spectrum of GRB 091221

PC mode. Mean photon arrival: T0+6497 s

NH (Galactic)1.1 × 1021 cm-2
NH (intrinsic)1.9 (+1.7, -1.7) × 1021 cm-2
z of absorber0
Photon index1.74 (+0.42, -0.38)
Flux (0.3-10 keV)
(Observed)
1.91 (+0.52, -0.39) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.62 (+0.54, -0.48) × 10-12 erg cm-2 s-1
Counts to flux (obs)4.8 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)6.5 × 10-11 erg cm-2 ct-1
C-stat (dof)81.95 (102)
Exposure time3.7 ks

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