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Swift-XRT spectra of GRB 110818A

Last updated after receiving ObsID 00500914005, version 16

Data were analysed using HEASOFT version 6.35.2

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Add time-sliced spectrum.

The spectral fits assume a redshift: 3.36 (GCN 12284)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 384 to 66418 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+411 s

N_H (Galactic)	2.93 × 10²⁰ cm^-2
N_H (intrinsic)	6.0 (+14.1, -6.0) × 10²¹ cm^-2
z of absorber	3.36
Photon index	2.10 (+0.28, -0.22)
Flux (0.3-10 keV) (Observed)	1.94 (+0.30, -0.28) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.22 (+0.28, -0.26) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	2.90 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.31 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	171.53 (201)
Spectrum exposure	61 s

PC mode. Mean photon arrival: T0+6713 s

N_H (Galactic)	2.93 × 10²⁰ cm^-2
N_H (intrinsic)	1.4 (+0.8, -0.7) × 10²² cm^-2
z of absorber	3.36
Photon index	1.856 (+0.102, -0.098)
Flux (0.3-10 keV) (Observed)	3.82 (+0.27, -0.25) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.35 (+0.24, -0.23) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.52 × 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?	346.98 (392)
Spectrum exposure	22.2 ks

Late Time spectrum (T0 + 6160 to 66418 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+20448 s

N_H (Galactic)	2.93 × 10²⁰ cm^-2
N_H (intrinsic)	1.7 (+1.6, -1.4) × 10²² cm^-2
z of absorber	3.36
Photon index	1.95 (+0.20, -0.19)
Flux (0.3-10 keV) (Observed)	1.02 (+0.14, -0.12) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.20 (+0.13, -0.12) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.35 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.96 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	185.10 (216)
Spectrum exposure	19.8 ks