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Swift-XRT spectra of GRB 090720

Last updated after receiving ObsID 00357811003, version 13

Data were analysed using HEASOFT version 6.35.2

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Add time-sliced spectrum.

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

N_H (Galactic)	3.61 × 10²⁰ cm^-2
N_H (intrinsic)	0 (+1.12 × 10²¹, -0) cm^-2
z of absorber	0
Photon index	2.2 (+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 exposure	9.6 ks