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Swift-XRT spectra of GRB 080916A

Last updated after receiving ObsID 00324895018, version 18.

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The spectral fits assume a redshift: 0.689 (GCN 8254)

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Time-averaged spectrum (T0 + 73 to 47688 s)

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WT and PC mode spectra of GRB 080916A

WT mode. Mean photon arrival: T0+116 s

N_H (Galactic)	1.8 × 10²⁰ cm^-2
N_H (intrinsic)	7.85 (+0.78, -0.73) × 10²¹ cm^-2
z of absorber	0.689
Photon index	2.276 (+0.087, -0.083)
Flux (0.3-10 keV) (Observed)	8.70 (+0.39, -0.38) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.574 (+0.067, -0.096) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	3.3 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.0 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	429.47 (533)
Exposure time	173 s

PC mode. Mean photon arrival: T0+8188 s

N_H (Galactic)	1.8 × 10²⁰ cm^-2
N_H (intrinsic)	5.5 (+1.3, -1.2) × 10²¹ cm^-2
z of absorber	0.689
Photon index	1.88 (+0.13, -0.13)
Flux (0.3-10 keV) (Observed)	6.18 (+0.51, -0.47) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	8.47 (+0.60, -0.58) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	4.1 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.6 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	312.33 (377)
Exposure time	9.7 ks

Late Time spectrum (T0 + 5040 to 47688 s)

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PC mode spectrum of GRB 080916A

PC mode. Mean photon arrival: T0+13226 s

N_H (Galactic)	1.8 × 10²⁰ cm^-2
N_H (intrinsic)	5.8 (+1.7, -1.5) × 10²¹ cm^-2
z of absorber	0.689
Photon index	2.07 (+0.18, -0.18)
Flux (0.3-10 keV) (Observed)	3.07 (+0.33, -0.29) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.62 (+1.27, -0.43) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.7 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.6 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	234.28 (284)
Exposure time	8.3 ks