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Swift-XRT spectra of GRB 070721B

Last updated after receiving ObsID 00285654003, version 8

Data were analysed using HEASOFT version 6.35.2

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Add time-sliced spectrum.

The spectral fits assume a redshift: 3.626 (GCN 6651)

Jump to: Time-averaged|Late Time

Time-averaged spectrum (T0 + 98 to 12683 s)

Download spectral files for Time-averaged spectrum.

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WT and PC mode spectra of Time-averaged

WT mode. Mean photon arrival: T0+251 s

N_H (Galactic)	2.56 × 10²⁰ cm^-2
N_H (intrinsic)	6 (+7, -6) × 10²¹ cm^-2
z of absorber	3.626
Photon index	1.41 (+0.07, -0.07)
Flux (0.3-10 keV) (Observed)	4.80 (+0.27, -0.26) × 10^-10 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	5.01 (+0.25, -0.24) × 10^-10 erg cm^-2 s^-1
Counts to flux (obs)	4.42 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.61 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	544.29 (592)
Spectrum exposure	264 s

PC mode. Mean photon arrival: T0+4672 s

N_H (Galactic)	2.56 × 10²⁰ cm^-2
N_H (intrinsic)	1.1 (+0.8, -0.8) × 10²² cm^-2
z of absorber	3.626
Photon index	1.47 (+0.08, -0.08)
Flux (0.3-10 keV) (Observed)	2.67 (+0.16, -0.15) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.82 (+0.15, -0.14) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.40 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.66 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	407.87 (496)
Spectrum exposure	5.8 ks

Late Time spectrum (T0 + 4267 to 12683 s)

Download spectral files for Late Time spectrum.

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PC mode spectrum of Late Time

PC mode. Mean photon arrival: T0+7366 s

N_H (Galactic)	2.56 × 10²⁰ cm^-2
N_H (intrinsic)	1.31 (+1.08, -0.99) × 10²² cm^-2
z of absorber	3.626
Photon index	1.56 (+0.10, -0.10)
Flux (0.3-10 keV) (Observed)	1.19 (+0.10, -0.09) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	1.28 (+0.09, -0.08) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	4.16 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.47 × 10^-11 erg cm^-2 ct^-1
W-stat (dof) What's this?	342.51 (396)
Spectrum exposure	5.2 ks