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Swift-XRT spectra of GRB 211221A

Last updated after receiving ObsID 01090472001, version 12

Data were analysed using HEASOFT version 6.35.2

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Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 60 to 73663 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+83 s

N_H (Galactic)	1.37 × 10²¹ cm^-2
N_H (intrinsic)	9 (+4, -3) × 10²¹ cm^-2
z of absorber	0
Photon index	1.8 (+0.4, -0.4)
Flux (0.3-10 keV) (Observed)	3.6 (+0.7, -0.6) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.88 (+1.85, -0.96) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	4.98 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	8.16 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	201.12 (207)
Spectrum exposure	52 s

PC mode. Mean photon arrival: T0+4950 s

N_H (Galactic)	1.37 × 10²¹ cm^-2
N_H (intrinsic)	9.0 (+3.0, -2.8) × 10²¹ cm^-2
z of absorber	0
Photon index	1.52 (+0.27, -0.26)
Flux (0.3-10 keV) (Observed)	1.48 (+0.21, -0.18) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.08 (+0.28, -0.23) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	6.61 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	9.29 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	241.82 (266)
Spectrum exposure	5.8 ks

Late Time spectrum (T0 + 21374 to 73663 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+39549 s

N_H (Galactic)	1.37 × 10²¹ cm^-2
N_H (intrinsic)	8 (+9, -6) × 10²¹ cm^-2
z of absorber	0
Photon index	2.40 (+1.10, -0.90)
Flux (0.3-10 keV) (Observed)	4.6 (+2.5, -1.5) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.22 (+2.50, -0.52) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.97 × 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?	31.73 (39)
Spectrum exposure	4.9 ks