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Swift-XRT spectra of GRB 251221A

Last updated after receiving ObsID 01426088001, 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 + 142 to 56256 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+144 s

N_H (Galactic)	7.34 × 10²¹ cm^-2
N_H (intrinsic)	0 (+2.54 × 10²², -0) cm^-2
z of absorber	0
Photon index	0.0 (+1.9, -1.1)
Flux (0.3-10 keV) (Observed)	3.4 (+4.1, -2.0) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.9 (+6.1, -1.6) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	1.26 × 10^-10 erg cm^-2 ct^-1
Counts to flux (unabs)	1.05 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	15.26 (6)
Spectrum exposure	5 s

PC mode. Mean photon arrival: T0+2951 s

N_H (Galactic)	7.34 × 10²¹ cm^-2
N_H (intrinsic)	4.1 (+2.4, -2.2) × 10²¹ cm^-2
z of absorber	0
Photon index	1.53 (+0.19, -0.18)
Flux (0.3-10 keV) (Observed)	4.2 (+0.4, -0.3) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	6.0 (+0.6, -0.5) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	6.70 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	9.59 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	393.67 (441)
Spectrum exposure	4.7 ks

Late Time spectrum (T0 + 5035 to 56256 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+40434 s

N_H (Galactic)	7.34 × 10²¹ cm^-2
N_H (intrinsic)	1.2 (+2.6, -1.2) × 10²² cm^-2
z of absorber	0
Photon index	2.8 (+2.1, -1.4)
Flux (0.3-10 keV) (Observed)	4.8 (+4.3, -2.0) × 10^-13 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.67 (+0.96, -1.75) × 10^-12 erg cm^-2 s^-1
Counts to flux (obs)	4.20 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	2.32 × 10^-10 erg cm^-2 ct^-1
W-stat (dof) What's this?	20.34 (25)
Spectrum exposure	3.2 ks