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Swift-XRT spectra of GRB 110820A

Last updated after receiving ObsID 00501095006, version 10.

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Time-averaged spectrum (T0 + 82 to 24532 s)

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WT and PC mode spectra of GRB 110820A

WT mode. Mean photon arrival: T0+247 s

N_H (Galactic)	3.3 × 10²¹ cm^-2
N_H (intrinsic)	3.04 (+0.60, -0.56) × 10²¹ cm^-2
z of absorber	0
Photon index	1.260 (+0.070, -0.068)
Flux (0.3-10 keV) (Observed)	4.71 (+0.16, -0.16) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.94 (+0.17, -0.17) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	7.2 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	9.1 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	749.17 (764)
Exposure time	110 s

PC mode. Mean photon arrival: T0+4730 s

N_H (Galactic)	3.3 × 10²¹ cm^-2
N_H (intrinsic)	1.7 (+1.6, -1.4) × 10²¹ cm^-2
z of absorber	0
Photon index	1.82 (+0.28, -0.26)
Flux (0.3-10 keV) (Observed)	3.54 (+0.52, -0.44) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.55 (+1.10, -0.47) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	5.1 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.0 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	193.13 (247)
Exposure time	9.9 ks

Late Time spectrum (T0 + 4885 to 24532 s)

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PC mode spectrum of GRB 110820A

PC mode. Mean photon arrival: T0+13127 s

N_H (Galactic)	3.3 × 10²¹ cm^-2
N_H (intrinsic)	1.8 (+2.4, -1.8) × 10²¹ cm^-2
z of absorber	0
Photon index	2.61 (+0.57, -0.51)
Flux (0.3-10 keV) (Observed)	6.0 (+1.5, -1.2) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.80 (+1.63, -0.51) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.4 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.0 × 10^-10 erg cm^-2 ct^-1
C-stat (dof)	85.98 (97)
Exposure time	8.7 ks