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Swift-XRT spectra of GRB 210820A

Last updated after receiving ObsID 01069551005, version 3

Data were analysed using HEASOFT version 6.29

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 131 to 18217 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+268 s

N_H (Galactic)	3.59 × 10²⁰ cm^-2
N_H (intrinsic)	8.9 (+1.1, -1.1) × 10²⁰ cm^-2
z of absorber	0
Photon index	1.76 (+0.04, -0.03)
Flux (0.3-10 keV) (Observed)	1.75 (+0.04, -0.04) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.07 (+0.04, -0.04) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	3.77 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.48 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	740.44 (740)
Spectrum exposure	339 s

PC mode. Mean photon arrival: T0+2565 s

N_H (Galactic)	3.59 × 10²⁰ cm^-2
N_H (intrinsic)	0 (+3.97 × 10²⁰, -0) cm^-2
z of absorber	0
Photon index	2.26 (+0.26, -0.12)
Flux (0.3-10 keV) (Observed)	3.1 (+0.3, -0.4) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.6 (+0.4, -0.4) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	2.87 × 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?	160.88 (175)
Spectrum exposure	6.2 ks

Late Time spectrum (T0 + 5919 to 18217 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+8745 s

N_H (Galactic)	3.59 × 10²⁰ cm^-2
N_H (intrinsic)	5.0 (+13.9, -5.0) × 10²⁰ cm^-2
z of absorber	0
Photon index	2.0 (+0.6, -0.4)
Flux (0.3-10 keV) (Observed)	7.3 (+2.5, -1.8) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	8.8 (+2.3, -1.9) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	3.25 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.93 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	98.33 (62)
Spectrum exposure	4.8 ks