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Swift-XRT spectra of GRB 161220A

Last updated after receiving ObsID 00727610004, version 7

Data were analysed using HEASOFT version 6.35.2

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 75 to 16832 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+97 s

N_H (Galactic)	1.19 × 10²⁰ cm^-2
N_H (intrinsic)	3.4 (+0.5, -0.4) × 10²¹ cm^-2
z of absorber	0
Photon index	3.48 (+0.19, -0.18)
Flux (0.3-10 keV) (Observed)	5.61 (+0.29, -0.27) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.61 (+0.19, -0.46) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	2.18 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.01 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	238.29 (276)
Spectrum exposure	67 s

PC mode. Mean photon arrival: T0+1997 s

N_H (Galactic)	1.19 × 10²⁰ cm^-2
N_H (intrinsic)	0 (+5.50 × 10²⁰, -0) cm^-2
z of absorber	0
Photon index	2.01 (+0.31, -0.18)
Flux (0.3-10 keV) (Observed)	2.6 (+0.4, -0.4) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.6 (+0.4, -0.4) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.18 × 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?	115.60 (128)
Spectrum exposure	3.2 ks

Late Time spectrum (T0 + 4955 to 16832 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+10725 s

N_H (Galactic)	1.19 × 10²⁰ cm^-2
N_H (intrinsic)	0 (+1.09 × 10²¹, -0) cm^-2
z of absorber	0
Photon index	1.6 (+0.7, -0.6)
Flux (0.3-10 keV) (Observed)	5.4 (+2.6, -2.2) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.7 (+2.4, -2.2) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	3.86 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.02 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	23.85 (20)
Spectrum exposure	2.1 ks