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Swift-XRT spectra of GRB 090418A

Last updated after receiving ObsID 00349510007, version 12

Data were analysed using HEASOFT version 6.29

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Add time-sliced spectrum.

The spectral fits assume a redshift: 1.608 (GCN 9151)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 102 to 18399 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+149 s

N_H (Galactic)	4.09 × 10²⁰ cm^-2
N_H (intrinsic)	8 (+4, -3) × 10²¹ cm^-2
z of absorber	1.608
Photon index	2.03 (+0.17, -0.15)
Flux (0.3-10 keV) (Observed)	2.56 (+0.27, -0.25) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.27 (+0.26, -0.25) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.14 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.02 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	285.30 (320)
Spectrum exposure	116 s

PC mode. Mean photon arrival: T0+8020 s

N_H (Galactic)	4.09 × 10²⁰ cm^-2
N_H (intrinsic)	1.53 (+0.30, -0.28) × 10²² cm^-2
z of absorber	1.608
Photon index	1.93 (+0.09, -0.09)
Flux (0.3-10 keV) (Observed)	1.62 (+0.10, -0.09) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.157 (+0.103, -0.098) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.63 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.82 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	403.01 (447)
Spectrum exposure	8.6 ks

Late Time spectrum (T0 + 4234 to 18399 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+9857 s

N_H (Galactic)	4.09 × 10²⁰ cm^-2
N_H (intrinsic)	1.6 (+0.4, -0.3) × 10²² cm^-2
z of absorber	1.608
Photon index	1.92 (+0.10, -0.10)
Flux (0.3-10 keV) (Observed)	1.21 (+0.08, -0.07) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.61 (+0.09, -0.08) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.68 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.90 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	347.92 (419)
Spectrum exposure	7.8 ks