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Swift-XRT spectra of GRB 121229A

Last updated after receiving ObsID 00544347001, version 4.

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The spectral fits assume a redshift: 2.707 (GCN 14120)

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Time-averaged spectrum (T0 + 0 to 75012 s)

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WT and PC mode spectra of GRB 121229A

WT mode. Mean photon arrival: T0+422 s

N_H (Galactic)	1.4 × 10²¹ cm^-2
N_H (intrinsic)	1.62 (+0.24, -0.23) × 10²² cm^-2
z of absorber	2.707
Photon index	2.143 (+0.049, -0.048)
Flux (0.3-10 keV) (Observed)	7.72 (+0.23, -0.22) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.220 (+0.035, -0.033) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	3.4 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.4 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	621.82 (629)
Exposure time	371 s

PC mode. Mean photon arrival: T0+15137 s

N_H (Galactic)	1.4 × 10²¹ cm^-2
N_H (intrinsic)	0 (+9.7 × 10²¹, -0) cm^-2
z of absorber	2.707
Photon index	2.18 (+0.29, -0.16)
Flux (0.3-10 keV) (Observed)	9.5 (+1.3, -1.4) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.38 (+0.18, -0.14) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	3.4 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.9 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	126.96 (170)
Exposure time	14.6 ks

Late Time spectrum (T0 + 4000 to 75012 s)

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PC mode spectrum of GRB 121229A

PC mode. Mean photon arrival: T0+34284 s

N_H (Galactic)	1.4 × 10²¹ cm^-2
N_H (intrinsic)	3.2 (+25.6, -3.2) × 10²¹ cm^-2
z of absorber	2.707
Photon index	2.08 (+0.48, -0.33)
Flux (0.3-10 keV) (Observed)	3.26 (+0.88, -0.74) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	4.64 (+1.45, -0.75) × 10^-13 erg cm^-2 s^-1
Counts to flux (obs)	3.6 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	5.2 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	88.06 (86)
Exposure time	14.4 ks