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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

N_H (Galactic)	1.1 × 10²¹ cm^-2
N_H (intrinsic)	3.10 (+0.46, -0.44) × 10²¹ cm^-2
z of absorber	0
Photon index	2.50 (+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 time	95 s

PC mode. Mean photon arrival: T0+4604 s

N_H (Galactic)	1.1 × 10²¹ cm^-2
N_H (intrinsic)	9.0 (+11.7, -9.0) × 10²⁰ cm^-2
z of absorber	0
Photon index	1.71 (+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 time	4.3 ks

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

N_H (Galactic)	1.1 × 10²¹ cm^-2
N_H (intrinsic)	1.9 (+1.7, -1.7) × 10²¹ cm^-2
z of absorber	0
Photon index	1.74 (+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 time	3.7 ks