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Swift-XRT spectra of GRB 210818A

Last updated after receiving ObsID 01069169007, version 8

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 65 to 75043 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+105 s

N_H (Galactic)	1.74 × 10²¹ cm^-2
N_H (intrinsic)	9 (+5, -4) × 10²⁰ cm^-2
z of absorber	0
Photon index	0.82 (+0.06, -0.06)
Flux (0.3-10 keV) (Observed)	4.50 (+0.17, -0.17) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.78 (+0.14, -0.15) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	7.52 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.98 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	778.28 (785)
Spectrum exposure	188 s

PC mode. Mean photon arrival: T0+2998 s

N_H (Galactic)	1.74 × 10²¹ cm^-2
N_H (intrinsic)	0 (+5.32 × 10²⁰, -0) cm^-2
z of absorber	0
Photon index	1.580 (+0.133, -0.080)
Flux (0.3-10 keV) (Observed)	2.83 (+0.20, -0.23) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.31 (+0.22, -0.21) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.48 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.25 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	373.20 (390)
Spectrum exposure	8.0 ks

Late Time spectrum (T0 + 10970 to 75043 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+27908 s

N_H (Galactic)	1.74 × 10²¹ cm^-2
N_H (intrinsic)	0 (+2.32 × 10²¹, -0) cm^-2
z of absorber	0
Photon index	1.8 (+0.6, -0.3)
Flux (0.3-10 keV) (Observed)	6.1 (+1.7, -1.7) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	7.7 (+1.9, -1.4) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	3.82 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.85 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	70.37 (66)
Spectrum exposure	6.5 ks