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Swift-XRT spectra of GRB 180818A

Last updated after receiving ObsID 00853824991, version 0

Data were analysed using HEASOFT version 6.26.1

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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, -2.4) × 1021 cm-2
z of absorber0
Photon index3.5 (+0.6, -0.5)
Flux (0.3-10 keV)
(Observed)
2.5 (+0.4, -0.4) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.5 (+3.1, -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)2.47 × 10-10 erg cm-2 ct-1
W-stat (dof)
What's this?
111.05 (152)
Spectrum exposure27 s

PC mode. Mean photon arrival: T0+5468 s

NH (Galactic)1.14 × 1021 cm-2
NH (intrinsic)8.4 (+2.9, -2.4) × 1021 cm-2
z of absorber0
Photon index3.0 (+0.4, -0.4)
Flux (0.3-10 keV)
(Observed)
8.0 (+1.3, -1.1) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
3.8 (+3.2, -1.0) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.06 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)1.48 × 10-10 erg cm-2 ct-1
W-stat (dof)
What's this?
118.76 (166)
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+12321 s

NH (Galactic)1.14 × 1021 cm-2
NH (intrinsic)5.7 (+3.8, -3.0) × 1021 cm-2
z of absorber0
Photon index2.8 (+0.7, -0.6)
Flux (0.3-10 keV)
(Observed)
3.73 (+1.06, -0.79) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.31 (+1.84, -0.34) × 10-12 erg cm-2 s-1
Counts to flux (obs)2.93 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)1.03 × 10-10 erg cm-2 ct-1
W-stat (dof)
What's this?
59.91 (88)
Spectrum exposure9.8 ks

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