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Swift-XRT spectra of GRB 180404B

Last updated after receiving ObsID 00821902004, version 11

Data were analysed using HEASOFT version 6.35.2

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 76 to 40528 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+158 s

N_H (Galactic)	1.13 × 10²⁰ cm^-2
N_H (intrinsic)	3.67 (+0.26, -0.26) × 10²¹ cm^-2
z of absorber	0
Photon index	1.61 (+0.04, -0.04)
Flux (0.3-10 keV) (Observed)	3.55 (+0.09, -0.09) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.57 (+0.10, -0.09) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	4.76 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.12 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	746.82 (774)
Spectrum exposure	349 s

PC mode. Mean photon arrival: T0+7269 s

N_H (Galactic)	1.13 × 10²⁰ cm^-2
N_H (intrinsic)	3.5 (+0.7, -0.6) × 10²¹ cm^-2
z of absorber	0
Photon index	1.98 (+0.14, -0.14)
Flux (0.3-10 keV) (Observed)	8.0 (+0.6, -0.6) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.21 (+0.08, -0.08) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.87 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.85 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	334.53 (382)
Spectrum exposure	10.3 ks

Late Time spectrum (T0 + 5188 to 40528 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+11419 s

N_H (Galactic)	1.13 × 10²⁰ cm^-2
N_H (intrinsic)	3.8 (+0.9, -0.8) × 10²¹ cm^-2
z of absorber	0
Photon index	2.19 (+0.20, -0.19)
Flux (0.3-10 keV) (Observed)	3.5 (+0.4, -0.3) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.0 (+0.5, -0.6) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.50 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	6.07 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	268.07 (290)
Spectrum exposure	9.0 ks