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Swift-XRT spectra of GRB 180818B

Last updated after receiving ObsID 00853882001, version 5

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 210 to 12680 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+281 s

N_H (Galactic)	1.27 × 10²¹ cm^-2
N_H (intrinsic)	1.76 (+0.25, -0.24) × 10²¹ cm^-2
z of absorber	0
Photon index	3.47 (+0.12, -0.11)
Flux (0.3-10 keV) (Observed)	5.19 (+0.16, -0.15) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.15 (+0.29, -0.24) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	2.17 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.98 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	354.50 (397)
Spectrum exposure	205 s

PC mode. Mean photon arrival: T0+6653 s

N_H (Galactic)	1.27 × 10²¹ cm^-2
N_H (intrinsic)	0 (+1.36 × 10²⁰, -0) cm^-2
z of absorber	0
Photon index	1.78 (+0.08, -0.07)
Flux (0.3-10 keV) (Observed)	1.30 (+0.09, -0.07) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.53 (+0.08, -0.09) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.81 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.47 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	310.19 (395)
Spectrum exposure	5.6 ks

Late Time spectrum (T0 + 4469 to 12680 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+8248 s

N_H (Galactic)	1.27 × 10²¹ cm^-2
N_H (intrinsic)	2.2 (+5.0, -2.2) × 10²⁰ cm^-2
z of absorber	0
Photon index	1.79 (+0.15, -0.13)
Flux (0.3-10 keV) (Observed)	1.05 (+0.10, -0.09) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.28 (+0.09, -0.08) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.85 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.69 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	285.51 (351)
Spectrum exposure	4.9 ks