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Swift/XRT spectra of GRB 091221

Last updated using ObsID 00380311006, version 8

Related pages: Burst Analyser | Enhanced position | Light curve | Download obs data | SPER analysis

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Time-averaged spectrum (T0 + 78 to 11604 s)

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WT and PC mode spectra of GRB 091221

WT mode. Mean photon arrival: T0+116 s

NH (Galactic)1.1e+21 cm-2
NH (intrinsic)2.76 (+0.42, -0.41) x 1021 cm-2
z of absorber0
Photon index2.54 (+0.14, -0.13)
Flux (0.3-10 keV)
(Observed)		6.56 (+0.38, -0.37) x 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)		1.7 x 10-9 erg cm-2 s-1
Counts to flux (obs)3.3 x 10-11 erg cm-2 ct-1
Counts to flux (unabs)8.3 x 10-11 erg cm-2 ct-1
C-stat (dof)416.87 (429)
Exposure time95 s

PC mode. Mean photon arrival: T0+1956 s

NH (Galactic)1.1e+21 cm-2
NH (intrinsic)4.1 (+13.8, -4.1) x 1020 cm-2
z of absorber0
Photon index1.96 (+0.50, -0.32)
Flux (0.3-10 keV)
(Observed)		7.6 (+2.1, -5.3) x 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)		1.0 x 10-11 erg cm-2 s-1
Counts to flux (obs)4.2 x 10-11 erg cm-2 ct-1
Counts to flux (unabs)5.7 x 10-11 erg cm-2 ct-1
C-stat (dof)54.98 (81)
Exposure time879 s

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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+6566 s

NH (Galactic)1.1e+21 cm-2
NH (intrinsic)1.9 (+1.7, -1.6) x 1021 cm-2
z of absorber0
Photon index1.87 (+0.29, -0.40)
Flux (0.3-10 keV)
(Observed)		1.88 (+0.56, -1.18) x 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)		2.7 x 10-12 erg cm-2 s-1
Counts to flux (obs)4.8 x 10-11 erg cm-2 ct-1
Counts to flux (unabs)7.0 x 10-11 erg cm-2 ct-1
C-stat (dof)90.71 (114)
Exposure time3.7 ks

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