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Swift-XRT spectra of GRB 180721A

Last updated after receiving ObsID 00849018003, version 6

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 63 to 17693 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+69 s

N_H (Galactic)	6.47 × 10²⁰ cm^-2
N_H (intrinsic)	1.5 (+2.6, -1.5) × 10²¹ cm^-2
z of absorber	0
Photon index	1.6 (+0.5, -0.4)
Flux (0.3-10 keV) (Observed)	4.7 (+1.5, -1.2) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.6 (+1.3, -1.1) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	3.79 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.53 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	103.52 (123)
Spectrum exposure	17 s

PC mode. Mean photon arrival: T0+2853 s

N_H (Galactic)	6.47 × 10²⁰ cm^-2
N_H (intrinsic)	8 (+7, -6) × 10²⁰ cm^-2
z of absorber	0
Photon index	2.24 (+0.27, -0.26)
Flux (0.3-10 keV) (Observed)	2.9 (+0.4, -0.4) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.1 (+0.5, -0.5) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.01 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.27 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	153.51 (186)
Spectrum exposure	6.6 ks

Late Time spectrum (T0 + 5279 to 17693 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+10033 s

N_H (Galactic)	6.47 × 10²⁰ cm^-2
N_H (intrinsic)	1.9 (+14.1, -1.9) × 10²⁰ cm^-2
z of absorber	0
Photon index	2.0 (+0.6, -0.3)
Flux (0.3-10 keV) (Observed)	8.0 (+2.3, -2.0) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	9.7 (+2.6, -2.1) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	3.23 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	3.91 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	58.48 (65)
Spectrum exposure	5.0 ks