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Swift-XRT spectra of GRB 091020

Last updated after receiving ObsID 00373458016, version 13

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 1.71 (GCN 10053)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 87 to 64740 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+201 s

N_H (Galactic)	1.45 × 10²⁰ cm^-2
N_H (intrinsic)	7.9 (+1.5, -1.4) × 10²¹ cm^-2
z of absorber	1.71
Photon index	1.87 (+0.06, -0.06)
Flux (0.3-10 keV) (Observed)	5.18 (+0.21, -0.21) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.10 (+0.20, -0.19) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.47 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.08 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	505.31 (573)
Spectrum exposure	346 s

PC mode. Mean photon arrival: T0+16719 s

N_H (Galactic)	1.45 × 10²⁰ cm^-2
N_H (intrinsic)	8.4 (+1.7, -1.6) × 10²¹ cm^-2
z of absorber	1.71
Photon index	2.02 (+0.08, -0.07)
Flux (0.3-10 keV) (Observed)	5.36 (+0.26, -0.24) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.60 (+0.26, -0.25) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.25 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.01 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	430.77 (468)
Spectrum exposure	28.0 ks

Late Time spectrum (T0 + 4883 to 64740 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+22111 s

N_H (Galactic)	1.45 × 10²⁰ cm^-2
N_H (intrinsic)	8.2 (+2.0, -1.9) × 10²¹ cm^-2
z of absorber	1.71
Photon index	2.03 (+0.09, -0.09)
Flux (0.3-10 keV) (Observed)	3.61 (+0.20, -0.19) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.45 (+0.21, -0.20) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.24 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.99 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	369.33 (419)
Spectrum exposure	26.9 ks