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Swift-XRT spectra of GRB 090720

Last updated after receiving ObsID 00357811003, version 13

Data were analysed using HEASOFT version 6.32

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Time-averaged spectrum (T0 + 39568 to 143935 s)

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PC mode spectrum of Time-averaged

WT mode. Mean photon arrival: T0+39570 s

Can't find a valid fit for this spectrum

PC mode. Mean photon arrival: T0+76426 s

NH (Galactic)3.61 × 1020 cm-2
NH (intrinsic)0 (+1.12 × 1021, -0) cm-2
z of absorber0
Photon index2.2 (+0.7, -0.3)
Flux (0.3-10 keV)
(Observed)		2.2 (+0.6, -0.6) × 10-13 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)		2.5 (+0.7, -0.7) × 10-13 erg cm-2 s-1
Counts to flux (obs)2.88 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)3.26 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?		52.90 (43)
Spectrum exposure9.6 ks