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Swift-XRT spectra of GRB 090530

Last updated after receiving ObsID 00353567009, version 10.

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Time-averaged spectrum (T0 + 81 to 30235 s)

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WT and PC mode spectra of GRB 090530

WT mode. Mean photon arrival: T0+90 s

N_H (Galactic)	1.8 × 10²⁰ cm^-2
N_H (intrinsic)	7.4 (+7.0, -5.6) × 10²⁰ cm^-2
z of absorber	0
Photon index	2.64 (+0.47, -0.39)
Flux (0.3-10 keV) (Observed)	2.81 (+0.52, -0.44) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.46 (+0.88, -0.87) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	2.4 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.7 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	98.73 (143)
Exposure time	22 s

PC mode. Mean photon arrival: T0+9511 s

N_H (Galactic)	1.8 × 10²⁰ cm^-2
N_H (intrinsic)	6.3 (+3.5, -3.2) × 10²⁰ cm^-2
z of absorber	0
Photon index	2.04 (+0.16, -0.16)
Flux (0.3-10 keV) (Observed)	3.32 (+0.29, -0.26) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.15 (+0.30, -0.31) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.5 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.4 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	287.02 (319)
Exposure time	11.1 ks

Late Time spectrum (T0 + 5134 to 30235 s)

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PC mode spectrum of GRB 090530

PC mode. Mean photon arrival: T0+15022 s

N_H (Galactic)	1.8 × 10²⁰ cm^-2
N_H (intrinsic)	9.3 (+4.7, -4.2) × 10²⁰ cm^-2
z of absorber	0
Photon index	2.23 (+0.22, -0.21)
Flux (0.3-10 keV) (Observed)	1.96 (+0.21, -0.19) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.78 (+0.27, -0.30) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.2 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.6 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	240.14 (246)
Exposure time	10.4 ks