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Swift-XRT spectra of GRB 090404

Last updated after receiving ObsID 00348428018, version 16

Data were analysed using HEASOFT version 6.32

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Add time-sliced spectrum.

The spectral fits assume a redshift: 3 (Perley et al. 2013)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 91 to 88036 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+127 s

N_H (Galactic)	2.20 × 10²⁰ cm^-2
N_H (intrinsic)	9.8 (+0.7, -0.6) × 10²² cm^-2
z of absorber	3
Photon index	2.59 (+0.06, -0.06)
Flux (0.3-10 keV) (Observed)	2.90 (+0.09, -0.08) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.37 (+0.33, -0.30) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	2.76 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.05 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	571.53 (518)
Spectrum exposure	129 s

PC mode. Mean photon arrival: T0+20691 s

N_H (Galactic)	2.20 × 10²⁰ cm^-2
N_H (intrinsic)	1.22 (+0.18, -0.16) × 10²³ cm^-2
z of absorber	3
Photon index	2.24 (+0.11, -0.11)
Flux (0.3-10 keV) (Observed)	3.20 (+0.19, -0.18) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.8 (+0.5, -0.4) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.38 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.10 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	388.38 (425)
Spectrum exposure	25.5 ks

Late Time spectrum (T0 + 4503 to 88036 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+23869 s

N_H (Galactic)	2.20 × 10²⁰ cm^-2
N_H (intrinsic)	1.24 (+0.19, -0.17) × 10²³ cm^-2
z of absorber	3
Photon index	2.23 (+0.12, -0.11)
Flux (0.3-10 keV) (Observed)	2.81 (+0.18, -0.17) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.0 (+0.4, -0.4) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.41 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.13 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	358.86 (405)
Spectrum exposure	24.4 ks