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Swift-XRT spectra of GRB 170531B

Last updated after receiving ObsID 00755354007, version 16

Data were analysed using HEASOFT version 6.29

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The spectral fits assume a redshift: 2.366 (GCN 21177)

Jump to: Time-averaged|Late Time


Time-averaged spectrum (T0 + 147 to 18745 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+183 s

NH (Galactic)1.41 × 1021 cm-2
NH (intrinsic)1.6 (+0.4, -0.4) × 1022 cm-2
z of absorber2.366
Photon index1.40 (+0.04, -0.04)
Flux (0.3-10 keV)
(Observed)
3.01 (+0.09, -0.09) × 10-9 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
3.45 (+0.09, -0.09) × 10-9 erg cm-2 s-1
Counts to flux (obs)5.03 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)5.77 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
695.29 (729)
Spectrum exposure131 s

PC mode. Mean photon arrival: T0+3083 s

NH (Galactic)1.41 × 1021 cm-2
NH (intrinsic)0 (+4.22 × 1021, -0) cm-2
z of absorber2.366
Photon index2.00 (+0.15, -0.11)
Flux (0.3-10 keV)
(Observed)
6.2 (+0.6, -0.7) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
8.0 (+0.7, -0.6) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.38 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.37 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
152.92 (228)
Spectrum exposure3.7 ks

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Late Time spectrum (T0 + 5502 to 18745 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+7712 s

NH (Galactic)1.41 × 1021 cm-2
NH (intrinsic)0 (+1.90 × 1022, -0) cm-2
z of absorber2.366
Photon index1.73 (+0.34, -0.21)
Flux (0.3-10 keV)
(Observed)
2.5 (+0.5, -0.5) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
3.0 (+0.5, -0.5) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.94 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.70 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
79.86 (107)
Spectrum exposure2.5 ks

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