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Swift-XRT spectra of GRB 180904A

Last updated after receiving ObsID 00859282002, version 7

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 129 to 51871 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+164 s

N_H (Galactic)	3.37 × 10²⁰ cm^-2
N_H (intrinsic)	4.6 (+0.9, -0.8) × 10²¹ cm^-2
z of absorber	0
Photon index	2.65 (+0.24, -0.22)
Flux (0.3-10 keV) (Observed)	2.58 (+0.26, -0.25) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.85 (+1.75, -0.39) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	2.87 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.61 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	248.08 (298)
Spectrum exposure	91 s

PC mode. Mean photon arrival: T0+2721 s

N_H (Galactic)	3.37 × 10²⁰ cm^-2
N_H (intrinsic)	5.1 (+1.6, -1.4) × 10²¹ cm^-2
z of absorber	0
Photon index	2.4 (+0.3, -0.3)
Flux (0.3-10 keV) (Observed)	3.6 (+0.6, -0.5) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	7.9 (+2.7, -1.4) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.38 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.49 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	149.75 (190)
Spectrum exposure	8.4 ks

Late Time spectrum (T0 + 4001 to 51871 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+15740 s

N_H (Galactic)	3.37 × 10²⁰ cm^-2
N_H (intrinsic)	6 (+6, -4) × 10²¹ cm^-2
z of absorber	0
Photon index	3.04 (+1.23, -0.96)
Flux (0.3-10 keV) (Observed)	2.12 (+1.05, -0.65) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	9.4 (+37.3, -2.3) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	2.73 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.21 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	25.45 (35)
Spectrum exposure	7.9 ks