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Swift-XRT spectra of GRB 090530

Last updated after receiving ObsID 00353567009, version 11

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 1.266 (GCN 15571)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 81 to 30255 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+90 s

N_H (Galactic)	1.90 × 10²⁰ cm^-2
N_H (intrinsic)	2.0 (+3.1, -2.0) × 10²¹ cm^-2
z of absorber	1.266
Photon index	2.5 (+0.4, -0.3)
Flux (0.3-10 keV) (Observed)	3.0 (+0.5, -0.4) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.8 (+0.8, -0.6) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	2.51 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.14 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	103.57 (140)
Spectrum exposure	22 s

PC mode. Mean photon arrival: T0+10425 s

N_H (Galactic)	1.90 × 10²⁰ cm^-2
N_H (intrinsic)	3.8 (+1.9, -1.8) × 10²¹ cm^-2
z of absorber	1.266
Photon index	1.92 (+0.14, -0.13)
Flux (0.3-10 keV) (Observed)	3.45 (+0.31, -0.29) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.03 (+0.29, -0.28) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.39 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.96 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	293.81 (311)
Spectrum exposure	11.1 ks

Late Time spectrum (T0 + 5134 to 30255 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+15025 s

N_H (Galactic)	1.90 × 10²⁰ cm^-2
N_H (intrinsic)	5.5 (+2.5, -2.3) × 10²¹ cm^-2
z of absorber	1.266
Photon index	2.06 (+0.17, -0.17)
Flux (0.3-10 keV) (Observed)	2.12 (+0.23, -0.20) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.67 (+0.24, -0.22) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.18 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.01 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	225.15 (253)
Spectrum exposure	10.5 ks