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Swift-XRT spectra of GRB 181228A

Last updated after receiving ObsID 00879909005, version 6

Data were analysed using HEASOFT version -1

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 88 to 29616 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+318 s

N_H (Galactic)	2.85 × 10²¹ cm^-2
N_H (intrinsic)	1.19 (+0.28, -0.27) × 10²¹ cm^-2
z of absorber	0
Photon index	1.66 (+0.05, -0.05)
Flux (0.3-10 keV) (Observed)	1.20 (+0.03, -0.03) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.59 (+0.03, -0.03) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	4.65 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.15 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	743.56 (763)
Spectrum exposure	405 s

PC mode. Mean photon arrival: T0+2683 s

N_H (Galactic)	2.85 × 10²¹ cm^-2
N_H (intrinsic)	2.4 (+1.4, -1.3) × 10²¹ cm^-2
z of absorber	0
Photon index	1.81 (+0.20, -0.19)
Flux (0.3-10 keV) (Observed)	3.7 (+0.4, -0.4) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.5 (+0.7, -0.5) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.54 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.68 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	242.80 (330)
Spectrum exposure	2.9 ks

Late Time spectrum (T0 + 12874 to 29616 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+15598 s

N_H (Galactic)	2.85 × 10²¹ cm^-2
N_H (intrinsic)	2.6 (+4.8, -2.6) × 10²¹ cm^-2
z of absorber	0
Photon index	1.9 (+0.7, -0.6)
Flux (0.3-10 keV) (Observed)	2.77 (+1.04, -0.74) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.2 (+2.3, -1.0) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	4.26 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.55 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	58.69 (69)
Spectrum exposure	2.0 ks