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Swift-XRT spectra of GRB 210818A

Last updated after receiving ObsID 01069169007, version 8

Data were analysed using HEASOFT version 6.35.2

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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, -5) × 10²⁰ cm^-2
z of absorber	0
Photon index	0.80 (+0.06, -0.06)
Flux (0.3-10 keV) (Observed)	5.62 (+0.21, -0.21) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.95 (+0.18, -0.19) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	7.72 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.17 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	787.58 (785)
Spectrum exposure	188 s

PC mode. Mean photon arrival: T0+3045 s

N_H (Galactic)	1.74 × 10²¹ cm^-2
N_H (intrinsic)	1.3 (+5.7, -1.3) × 10²⁰ cm^-2
z of absorber	0
Photon index	1.60 (+0.14, -0.10)
Flux (0.3-10 keV) (Observed)	2.81 (+0.24, -0.23) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.34 (+0.18, -0.22) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.57 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.42 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	366.73 (383)
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 (+2.38 × 10²¹, -0) cm^-2
z of absorber	0
Photon index	1.8 (+0.6, -0.3)
Flux (0.3-10 keV) (Observed)	6.2 (+1.8, -1.7) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	7.8 (+2.0, -1.5) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	3.93 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.97 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	70.54 (66)
Spectrum exposure	6.5 ks