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Swift-XRT spectra of GRB 091018

Last updated after receiving ObsID 00373172009, version 9

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 0.971 (GCN 10038)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 67 to 92753 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+105 s

N_H (Galactic)	3.07 × 10²⁰ cm^-2
N_H (intrinsic)	9.7 (+12.9, -9.7) × 10²⁰ cm^-2
z of absorber	0.971
Photon index	1.95 (+0.15, -0.15)
Flux (0.3-10 keV) (Observed)	3.8 (+0.4, -0.3) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.2 (+0.3, -0.3) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.24 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.65 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	264.39 (303)
Spectrum exposure	80 s

PC mode. Mean photon arrival: T0+17374 s

N_H (Galactic)	3.07 × 10²⁰ cm^-2
N_H (intrinsic)	2.6 (+0.9, -0.8) × 10²¹ cm^-2
z of absorber	0.971
Photon index	1.90 (+0.08, -0.08)
Flux (0.3-10 keV) (Observed)	5.01 (+0.28, -0.26) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.91 (+0.26, -0.25) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.47 × 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?	427.30 (447)
Spectrum exposure	31.0 ks

Late Time spectrum (T0 + 5841 to 92753 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+32665 s

N_H (Galactic)	3.07 × 10²⁰ cm^-2
N_H (intrinsic)	3.2 (+1.2, -1.2) × 10²¹ cm^-2
z of absorber	0.971
Photon index	2.00 (+0.12, -0.12)
Flux (0.3-10 keV) (Observed)	1.65 (+0.13, -0.12) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.03 (+0.13, -0.12) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.32 × 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?	292.81 (343)
Spectrum exposure	29.8 ks