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Swift-XRT spectra of GRB 090518

Last updated after receiving ObsID 00352420002, version 12.

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Time-averaged spectrum (T0 + 77 to 41928 s)

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WT and PC mode spectra of GRB 090518

WT mode. Mean photon arrival: T0+81 s

N_H (Galactic)	4.7 × 10²⁰ cm^-2
N_H (intrinsic)	5.7 (+8.7, -2.5) × 10²¹ cm^-2
z of absorber	0
Photon index	2.5 (+1.9, -1.0)
Flux (0.3-10 keV) (Observed)	1.77 (+1.14, -0.80) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.0 (1.00 × 10¹⁰, -2.1) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.3 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	9.4 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	28.19 (39)
Exposure time	9 s

PC mode. Mean photon arrival: T0+9087 s

N_H (Galactic)	4.7 × 10²⁰ cm^-2
N_H (intrinsic)	6.6 (+1.2, -1.1) × 10²¹ cm^-2
z of absorber	0
Photon index	2.59 (+0.23, -0.22)
Flux (0.3-10 keV) (Observed)	1.70 (+0.16, -0.15) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.57 (+1.70, -0.57) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.8 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.2 × 10^-10 erg cm^-2 ct^-1
C-stat (dof)	286.03 (324)
Exposure time	19.1 ks

Late Time spectrum (T0 + 4658 to 41928 s)

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PC mode spectrum of GRB 090518

PC mode. Mean photon arrival: T0+15572 s

N_H (Galactic)	4.7 × 10²⁰ cm^-2
N_H (intrinsic)	5.2 (+1.4, -1.2) × 10²¹ cm^-2
z of absorber	0
Photon index	2.45 (+0.29, -0.28)
Flux (0.3-10 keV) (Observed)	1.01 (+0.13, -0.11) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.68 (+0.92, -0.21) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.8 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	10.0 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	229.37 (231)
Exposure time	17.7 ks