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Swift-XRT spectra of GRB 090809

Last updated after receiving ObsID 00359530007, version 13

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 2.737 (GCN 9761)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 107 to 39639 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+175 s

N_H (Galactic)	8.16 × 10²⁰ cm^-2
N_H (intrinsic)	4.3 (+1.5, -1.3) × 10²² cm^-2
z of absorber	2.737
Photon index	1.63 (+0.11, -0.11)
Flux (0.3-10 keV) (Observed)	1.321 (+0.103, -0.096) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.63 (+0.10, -0.09) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	4.37 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.39 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	343.51 (441)
Spectrum exposure	47 s

PC mode. Mean photon arrival: T0+6834 s

N_H (Galactic)	8.16 × 10²⁰ cm^-2
N_H (intrinsic)	10 (+7, -6) × 10²¹ cm^-2
z of absorber	2.737
Photon index	1.84 (+0.11, -0.10)
Flux (0.3-10 keV) (Observed)	7.7 (+0.6, -0.5) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	9.3 (+0.5, -0.5) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.66 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.42 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	376.86 (397)
Spectrum exposure	10.9 ks

Late Time spectrum (T0 + 4000 to 39639 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+7903 s

N_H (Galactic)	8.16 × 10²⁰ cm^-2
N_H (intrinsic)	1.1 (+0.8, -0.7) × 10²² cm^-2
z of absorber	2.737
Photon index	1.92 (+0.13, -0.12)
Flux (0.3-10 keV) (Observed)	6.5 (+0.5, -0.5) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	8.0 (+0.5, -0.5) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.49 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.34 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	302.49 (346)
Spectrum exposure	10.2 ks