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Swift-XRT spectra of GRB 070220

Last updated after receiving ObsID 00261299003, version 17.

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Time-averaged spectrum (T0 + 85 to 41736 s)

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WT and PC mode spectra of GRB 070220

WT mode. Mean photon arrival: T0+154 s

N_H (Galactic)	3.5 × 10²¹ cm^-2
N_H (intrinsic)	1.52 (+0.51, -0.48) × 10²¹ cm^-2
z of absorber	0
Photon index	1.400 (+0.078, -0.077)
Flux (0.3-10 keV) (Observed)	1.374 (+0.058, -0.056) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.771 (+0.062, -0.059) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	6.4 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.2 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	681.81 (718)
Exposure time	209 s

PC mode. Mean photon arrival: T0+7054 s

N_H (Galactic)	3.5 × 10²¹ cm^-2
N_H (intrinsic)	1.96 (+0.76, -0.71) × 10²¹ cm^-2
z of absorber	0
Photon index	1.55 (+0.12, -0.11)
Flux (0.3-10 keV) (Observed)	1.137 (+0.070, -0.066) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.577 (+0.091, -0.080) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	6.3 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.8 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	499.15 (562)
Exposure time	18.5 ks

Late Time spectrum (T0 + 5063 to 41736 s)

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PC mode spectrum of GRB 070220

PC mode. Mean photon arrival: T0+12688 s

N_H (Galactic)	3.5 × 10²¹ cm^-2
N_H (intrinsic)	1.58 (+1.00, -0.90) × 10²¹ cm^-2
z of absorber	0
Photon index	1.61 (+0.17, -0.16)
Flux (0.3-10 keV) (Observed)	4.18 (+0.37, -0.33) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.90 (+0.51, -0.33) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	6.0 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.5 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	380.63 (430)
Exposure time	17.0 ks