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Swift-XRT spectra of GRB 150821A

Last updated after receiving ObsID 00652847011, version 19

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 0.755 (GCN 18187)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 249 to 42793 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+616 s

N_H (Galactic)	1.77 × 10²⁰ cm^-2
N_H (intrinsic)	2.01 (+0.10, -0.09) × 10²² cm^-2
z of absorber	0.755
Photon index	1.90 (+0.03, -0.03)
Flux (0.3-10 keV) (Observed)	9.23 (+0.17, -0.17) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.421 (+0.029, -0.028) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	4.24 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.52 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	798.75 (794)
Spectrum exposure	1.1 ks

PC mode. Mean photon arrival: T0+7500 s

N_H (Galactic)	1.77 × 10²⁰ cm^-2
N_H (intrinsic)	2.2 (+0.4, -0.3) × 10²² cm^-2
z of absorber	0.755
Photon index	2.19 (+0.16, -0.15)
Flux (0.3-10 keV) (Observed)	8.2 (+0.7, -0.6) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.55 (+0.20, -0.15) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.72 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.02 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	325.22 (371)
Spectrum exposure	8.8 ks

Late Time spectrum (T0 + 5860 to 42793 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+12416 s

N_H (Galactic)	1.77 × 10²⁰ cm^-2
N_H (intrinsic)	2.2 (+0.5, -0.5) × 10²² cm^-2
z of absorber	0.755
Photon index	2.31 (+0.22, -0.21)
Flux (0.3-10 keV) (Observed)	3.3 (+0.4, -0.3) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.76 (+1.43, -0.95) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.50 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.27 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	247.55 (263)
Spectrum exposure	8.2 ks