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Swift-XRT spectra of GRB 180821A

Last updated after receiving ObsID 00854578009, version 6

Data were analysed using HEASOFT version 6.32

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 216 to 73989 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+292 s

N_H (Galactic)	2.11 × 10²⁰ cm^-2
N_H (intrinsic)	6.7 (+0.8, -0.8) × 10²¹ cm^-2
z of absorber	0
Photon index	5.0 (+0.4, -0.4)
Flux (0.3-10 keV) (Observed)	1.854 (+0.100, -0.096) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.9 (+13.0, -2.2) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	1.90 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	7.08 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	222.57 (228)
Spectrum exposure	171 s

PC mode. Mean photon arrival: T0+21122 s

N_H (Galactic)	2.11 × 10²⁰ cm^-2
N_H (intrinsic)	4.9 (+1.2, -1.1) × 10²¹ cm^-2
z of absorber	0
Photon index	3.1 (+0.4, -0.3)
Flux (0.3-10 keV) (Observed)	1.10 (+0.14, -0.12) × 10^-12 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.52 (+2.23, -0.52) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	2.53 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.04 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	133.48 (182)
Spectrum exposure	13.2 ks

Late Time spectrum (T0 + 4000 to 73989 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+27337 s

N_H (Galactic)	2.11 × 10²⁰ cm^-2
N_H (intrinsic)	6.3 (+1.8, -1.5) × 10²¹ cm^-2
z of absorber	0
Photon index	3.0 (+0.4, -0.4)
Flux (0.3-10 keV) (Observed)	8.0 (+1.2, -1.0) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.46 (+2.18, -0.66) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	2.70 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	1.16 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	116.01 (160)
Spectrum exposure	12.8 ks