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Swift-XRT spectra of GRB 110731A

Last updated after receiving ObsID 00458448015, version 9

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 2.83 (GCN 12225)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 72 to 36083 s)

Download spectral files for Time-averaged spectrum.

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+246 s

N_H (Galactic)	1.65 × 10²¹ cm^-2
N_H (intrinsic)	4.4 (+3.1, -3.0) × 10²¹ cm^-2
z of absorber	2.83
Photon index	1.88 (+0.04, -0.04)
Flux (0.3-10 keV) (Observed)	6.86 (+0.18, -0.17) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	8.84 (+0.18, -0.18) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.67 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.73 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	687.75 (676)
Spectrum exposure	573 s

PC mode. Mean photon arrival: T0+8366 s

N_H (Galactic)	1.65 × 10²¹ cm^-2
N_H (intrinsic)	3 (+8, -3) × 10²¹ cm^-2
z of absorber	2.83
Photon index	1.76 (+0.10, -0.09)
Flux (0.3-10 keV) (Observed)	1.65 (+0.11, -0.11) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.04 (+0.11, -0.10) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.99 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.92 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	392.50 (435)
Spectrum exposure	7.5 ks

Late Time spectrum (T0 + 6053 to 36083 s)

Download spectral files for Late Time spectrum.

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+16008 s

N_H (Galactic)	1.65 × 10²¹ cm^-2
N_H (intrinsic)	5.2 (+13.1, -5.2) × 10²¹ cm^-2
z of absorber	2.83
Photon index	1.78 (+0.15, -0.13)
Flux (0.3-10 keV) (Observed)	6.1 (+0.6, -0.6) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	7.6 (+0.6, -0.5) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.96 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.94 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	274.63 (315)
Spectrum exposure	6.8 ks