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Swift-XRT spectra of GRB 250221A

Last updated after receiving ObsID 01290305001, version 9

Data were analysed using HEASOFT version 6.32

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The spectral fits assume a redshift: 0.768 (GCN 39418)

Jump to: Time-averaged|Late Time


Time-averaged spectrum (T0 + 126 to 28522 s)

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+129 s

NH (Galactic)3.73 × 1020 cm-2
NH (intrinsic)0 (+4.45 × 1021, -0) cm-2
z of absorber0.768
Photon index3.26 (+1.81, -0.73)
Flux (0.3-10 keV)
(Observed)
1.4 (+0.6, -0.6) × 10-10 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.8 (+4.6, -0.7) × 10-10 erg cm-2 s-1
Counts to flux (obs)2.20 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)2.83 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
13.11 (19)
Spectrum exposure5 s

PC mode. Mean photon arrival: T0+3201 s

NH (Galactic)3.73 × 1020 cm-2
NH (intrinsic)3.3 (+2.1, -1.8) × 1021 cm-2
z of absorber0.768
Photon index2.08 (+0.22, -0.21)
Flux (0.3-10 keV)
(Observed)
3.6 (+0.5, -0.4) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
4.7 (+0.6, -0.5) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.30 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.33 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
158.77 (214)
Spectrum exposure5.8 ks

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Late Time spectrum (T0 + 4278 to 28522 s)

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+9361 s

NH (Galactic)3.73 × 1020 cm-2
NH (intrinsic)6 (+5, -4) × 1021 cm-2
z of absorber0.768
Photon index2.1 (+0.4, -0.4)
Flux (0.3-10 keV)
(Observed)
1.18 (+0.30, -0.23) × 10-12 erg cm-2 s-1
Flux (0.3-10 keV)
(Unabsorbed)
1.71 (+0.47, -0.29) × 10-12 erg cm-2 s-1
Counts to flux (obs)3.42 × 10-11 erg cm-2 ct-1
Counts to flux (unabs)4.94 × 10-11 erg cm-2 ct-1
W-stat (dof)
What's this?
95.34 (98)
Spectrum exposure5.3 ks

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