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Swift-XRT spectra of GRB 131231A

Last updated after receiving ObsID 00020336007, version 7

Data were analysed using HEASOFT version 6.29

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The spectral fits assume a redshift: 0.642 (GCN 15645)


Time-averaged spectrum (T0 + 52149 to 62468 s)

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PC mode spectrum of Time-averaged

PC mode. Mean photon arrival: T0+57336 s

NH (Galactic)2.80 × 1020 cm-2
NH (intrinsic)2.8 (+1.2, -1.1) × 1021 cm-2
z of absorber0.642
Photon index1.77 (+0.15, -0.14)
Flux (0.3-10 keV)
(Observed)
1.77 (+0.18, -0.17) × 10-11 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
2.10 (+0.16, -0.15) × 10-11 erg cm-2 s-1
Counts to flux (obs)3.10 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)3.68 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
269.02 (312)
Spectrum exposure4.0 ks