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Swift-XRT spectra of GRB 180818A

Last updated after receiving ObsID 00853824002, version 5

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time


Time-averaged spectrum (T0 + 80 to 29447 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+90 s

NH (Galactic)1.14 × 1021 cm-2
NH (intrinsic)9.0 (+3.0, -2.3) × 1021 cm-2
z of absorber0
Photon index3.5 (+0.6, -0.5)
Flux (0.3-10 keV)
(Observed)
2.6 (+0.4, -0.4) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.6 (+3.0, -0.5) × 10-9 erg cm-2 s-1
Counts to flux (obs)2.48 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)2.44 × 10-10 erg cm-2 ct-1
W-stat (dof)
What's this?
111.17 (152)
Spectrum exposure27 s

PC mode. Mean photon arrival: T0+5764 s

NH (Galactic)1.14 × 1021 cm-2
NH (intrinsic)8.9 (+3.2, -2.6) × 1021 cm-2
z of absorber0
Photon index3.0 (+0.5, -0.4)
Flux (0.3-10 keV)
(Observed)
8.2 (+1.4, -1.2) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
4.3 (+4.3, -1.3) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.03 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)1.61 × 10-10 erg cm-2 ct-1
W-stat (dof)
What's this?
118.86 (160)
Spectrum exposure11.3 ks

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Late Time spectrum (T0 + 5059 to 29447 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+12219 s

NH (Galactic)1.14 × 1021 cm-2
NH (intrinsic)6 (+4, -3) × 1021 cm-2
z of absorber0
Photon index2.9 (+0.7, -0.6)
Flux (0.3-10 keV)
(Observed)
3.99 (+1.14, -0.84) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.52 (+2.25, -0.41) × 10-12 erg cm-2 s-1
Counts to flux (obs)2.92 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)1.12 × 10-10 erg cm-2 ct-1
W-stat (dof)
What's this?
59.53 (87)
Spectrum exposure9.8 ks

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