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Swift-XRT spectra of GRB 090102

Last updated after receiving ObsID 00338895008, version 25

Data were analysed using HEASOFT version 6.35.2

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Add time-sliced spectrum.

The spectral fits assume a redshift: 1.547 (GCN 8766)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 393 to 53551 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+503 s

N_H (Galactic)	4.69 × 10²⁰ cm^-2
N_H (intrinsic)	8.0 (+3.0, -2.7) × 10²¹ cm^-2
z of absorber	1.547
Photon index	1.69 (+0.11, -0.10)
Flux (0.3-10 keV) (Observed)	5.3 (+0.4, -0.4) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.2 (+0.3, -0.3) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.95 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.63 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	379.79 (449)
Spectrum exposure	240 s

PC mode. Mean photon arrival: T0+15138 s

N_H (Galactic)	4.69 × 10²⁰ cm^-2
N_H (intrinsic)	7.8 (+2.2, -2.0) × 10²¹ cm^-2
z of absorber	1.547
Photon index	1.68 (+0.08, -0.08)
Flux (0.3-10 keV) (Observed)	9.7 (+0.5, -0.5) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.13 (+0.05, -0.05) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.02 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.70 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	470.70 (496)
Spectrum exposure	17.6 ks

Late Time spectrum (T0 + 6179 to 53551 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+22137 s

N_H (Galactic)	4.69 × 10²⁰ cm^-2
N_H (intrinsic)	7.5 (+2.6, -2.4) × 10²¹ cm^-2
z of absorber	1.547
Photon index	1.70 (+0.10, -0.10)
Flux (0.3-10 keV) (Observed)	4.9 (+0.3, -0.3) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.71 (+0.31, -0.29) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.96 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.64 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	415.73 (424)
Spectrum exposure	16.8 ks