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Swift-XRT spectra of GRB 180720B

Last updated after receiving ObsID 00848890027, version 6

Data were analysed using HEASOFT version 6.32

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The spectral fits assume a redshift: 0.654 (GCN 22996)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 90 to 19397 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+1097 s

N_H (Galactic)	3.92 × 10²⁰ cm^-2
N_H (intrinsic)	3.70 (+0.11, -0.11) × 10²¹ cm^-2
z of absorber	0.654
Photon index	1.6956 (+0.0100, -0.0099)
Flux (0.3-10 keV) (Observed)	3.528 (+0.023, -0.023) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.218 (+0.022, -0.022) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	4.03 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.81 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	1490.33 (947)
Spectrum exposure	2.2 ks

PC mode. Mean photon arrival: T0+15413 s

N_H (Galactic)	3.92 × 10²⁰ cm^-2
N_H (intrinsic)	3.4 (+0.6, -0.5) × 10²¹ cm^-2
z of absorber	0.654
Photon index	1.77 (+0.06, -0.06)
Flux (0.3-10 keV) (Observed)	2.09 (+0.08, -0.08) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.53 (+0.08, -0.08) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.88 × 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?	484.30 (595)
Spectrum exposure	3.9 ks

Late Time spectrum (T0 + 11417 to 19397 s)

Download spectral files for Late Time spectrum.

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+15413 s

N_H (Galactic)	3.92 × 10²⁰ cm^-2
N_H (intrinsic)	3.4 (+0.6, -0.5) × 10²¹ cm^-2
z of absorber	0.654
Photon index	1.77 (+0.06, -0.06)
Flux (0.3-10 keV) (Observed)	2.09 (+0.08, -0.08) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.53 (+0.08, -0.08) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.88 × 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?	484.30 (595)
Spectrum exposure	3.9 ks