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Swift-XRT spectra of GRB 081221

Last updated after receiving ObsID 00337889007, version 16

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 2.26 (Kruhler et al. 2012, ApJ 758 46)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 72 to 45173 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+256 s

N_H (Galactic)	2.17 × 10²⁰ cm^-2
N_H (intrinsic)	4.97 (+0.26, -0.25) × 10²² cm^-2
z of absorber	2.26
Photon index	2.13 (+0.03, -0.03)
Flux (0.3-10 keV) (Observed)	1.319 (+0.026, -0.026) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.07 (+0.04, -0.04) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	3.37 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.29 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	738.36 (711)
Spectrum exposure	712 s

PC mode. Mean photon arrival: T0+15945 s

N_H (Galactic)	2.17 × 10²⁰ cm^-2
N_H (intrinsic)	6.9 (+0.9, -0.8) × 10²² cm^-2
z of absorber	2.26
Photon index	2.21 (+0.10, -0.10)
Flux (0.3-10 keV) (Observed)	6.0 (+0.3, -0.3) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.05 (+0.07, -0.06) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.43 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.00 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	465.86 (452)
Spectrum exposure	16.7 ks

Late Time spectrum (T0 + 4819 to 45173 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+15945 s

N_H (Galactic)	2.17 × 10²⁰ cm^-2
N_H (intrinsic)	6.9 (+0.9, -0.8) × 10²² cm^-2
z of absorber	2.26
Photon index	2.21 (+0.10, -0.10)
Flux (0.3-10 keV) (Observed)	6.0 (+0.3, -0.3) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.05 (+0.07, -0.06) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.43 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.00 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	465.86 (452)
Spectrum exposure	16.7 ks