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Swift-XRT spectra of GRB 130831A

Last updated after receiving ObsID 00568849012, version 8

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 0.4791 (GCN 15144)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 132 to 52294 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+161 s

N_H (Galactic)	5.74 × 10²⁰ cm^-2
N_H (intrinsic)	0 (+1.31 × 10²⁰, -0) cm^-2
z of absorber	0.4791
Photon index	2.63 (+0.14, -0.12)
Flux (0.3-10 keV) (Observed)	2.94 (+0.22, -0.20) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.87 (+0.26, -0.26) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	2.45 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.22 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	270.60 (255)
Spectrum exposure	73 s

PC mode. Mean photon arrival: T0+12555 s

N_H (Galactic)	5.74 × 10²⁰ cm^-2
N_H (intrinsic)	6 (+59, -6) × 10¹⁹ cm^-2
z of absorber	0.4791
Photon index	1.664 (+0.102, -0.072)
Flux (0.3-10 keV) (Observed)	1.11 (+0.07, -0.07) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.21 (+0.07, -0.07) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.93 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.29 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	403.58 (425)
Spectrum exposure	8.5 ks

Late Time spectrum (T0 + 9891 to 52294 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+18016 s

N_H (Galactic)	5.74 × 10²⁰ cm^-2
N_H (intrinsic)	1.2 (+0.8, -0.8) × 10²¹ cm^-2
z of absorber	0.4791
Photon index	1.79 (+0.13, -0.13)
Flux (0.3-10 keV) (Observed)	5.9 (+0.5, -0.5) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	7.0 (+0.5, -0.4) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.77 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.43 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	329.73 (352)
Spectrum exposure	7.8 ks