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Swift-XRT spectra of GRB 051221A

Last updated after receiving ObsID 00173780013, version 34

Data were analysed using HEASOFT version 6.35.2

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The spectral fits assume a redshift: 0.5465 (GCN 4384)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 93 to 65722 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+172 s

N_H (Galactic)	7.52 × 10²⁰ cm^-2
N_H (intrinsic)	1.5 (+1.2, -1.1) × 10²¹ cm^-2
z of absorber	0.5465
Photon index	2.08 (+0.20, -0.18)
Flux (0.3-10 keV) (Observed)	1.19 (+0.14, -0.13) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.57 (+0.16, -0.15) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.11 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.10 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	225.88 (265)
Spectrum exposure	167 s

PC mode. Mean photon arrival: T0+14530 s

N_H (Galactic)	7.52 × 10²⁰ cm^-2
N_H (intrinsic)	1.8 (+1.0, -0.9) × 10²¹ cm^-2
z of absorber	0.5465
Photon index	1.94 (+0.13, -0.13)
Flux (0.3-10 keV) (Observed)	1.70 (+0.14, -0.13) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.15 (+0.15, -0.14) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.49 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.43 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	351.82 (339)
Spectrum exposure	26.9 ks

Late Time spectrum (T0 + 5710 to 65722 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+25343 s

N_H (Galactic)	7.52 × 10²⁰ cm^-2
N_H (intrinsic)	1.5 (+1.2, -1.1) × 10²¹ cm^-2
z of absorber	0.5465
Photon index	1.95 (+0.18, -0.17)
Flux (0.3-10 keV) (Observed)	1.01 (+0.12, -0.10) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.28 (+0.12, -0.11) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.46 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.36 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	239.78 (264)
Spectrum exposure	24.6 ks