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Swift-XRT spectra of GRB 180818B

Last updated after receiving ObsID 00853882001, version 5

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time


Time-averaged spectrum (T0 + 210 to 12680 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+281 s

NH (Galactic)1.27 × 1021 cm-2
NH (intrinsic)1.76 (+0.25, -0.24) × 1021 cm-2
z of absorber0
Photon index3.47 (+0.12, -0.11)
Flux (0.3-10 keV)
(Observed)
5.19 (+0.16, -0.15) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.15 (+0.29, -0.24) × 10-9 erg cm-2 s-1
Counts to flux (obs)2.17 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)8.98 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
354.50 (397)
Spectrum exposure205 s

PC mode. Mean photon arrival: T0+6653 s

NH (Galactic)1.27 × 1021 cm-2
NH (intrinsic)0 (+1.36 × 1020, -0) cm-2
z of absorber0
Photon index1.78 (+0.08, -0.07)
Flux (0.3-10 keV)
(Observed)
1.30 (+0.09, -0.07) × 10-11 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.53 (+0.08, -0.09) × 10-11 erg cm-2 s-1
Counts to flux (obs)3.81 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.47 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
310.19 (395)
Spectrum exposure5.6 ks

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Late Time spectrum (T0 + 4469 to 12680 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+8248 s

NH (Galactic)1.27 × 1021 cm-2
NH (intrinsic)2.2 (+5.0, -2.2) × 1020 cm-2
z of absorber0
Photon index1.79 (+0.15, -0.13)
Flux (0.3-10 keV)
(Observed)
1.05 (+0.10, -0.09) × 10-11 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.28 (+0.09, -0.08) × 10-11 erg cm-2 s-1
Counts to flux (obs)3.85 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.69 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
285.51 (351)
Spectrum exposure4.9 ks

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