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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

N_H (Galactic)	1.86 × 10²¹ cm^-2
N_H (intrinsic)	3.1 (+0.7, -0.6) × 10²¹ cm^-2
z of absorber	0
Photon index	2.33 (+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 exposure	95 s

PC mode. Mean photon arrival: T0+4845 s

N_H (Galactic)	1.86 × 10²¹ cm^-2
N_H (intrinsic)	3.1 (+14.6, -3.1) × 10²⁰ cm^-2
z of absorber	0
Photon index	1.60 (+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 exposure	4.3 ks

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

N_H (Galactic)	1.86 × 10²¹ cm^-2
N_H (intrinsic)	1.4 (+2.6, -1.4) × 10²¹ cm^-2
z of absorber	0
Photon index	1.6 (+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 exposure	3.7 ks