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Swift-XRT spectra of GRB 080319B

Last updated after receiving ObsID 00306757030, version 21.

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The spectral fits assume a redshift: 0.94 (GCN 7444)

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Time-averaged spectrum (T0 + 64 to 30628 s)

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WT and PC mode spectra of GRB 080319B

WT mode. Mean photon arrival: T0+962 s

N_H (Galactic)	1.1 × 10²⁰ cm^-2
N_H (intrinsic)	1.688 (+0.089, -0.088) × 10²¹ cm^-2
z of absorber	0.94
Photon index	1.767 (+0.013, -0.013)
Flux (0.3-10 keV) (Observed)	2.349 (+0.021, -0.021) × 10^-9 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	2.640 (+0.060, -0.015) × 10^-9 erg cm^-2 s^-1
Counts to flux (obs)	3.7 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.1 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	1066.59 (887)
Exposure time	1.7 ks

PC mode. Mean photon arrival: T0+14553 s

N_H (Galactic)	1.1 × 10²⁰ cm^-2
N_H (intrinsic)	7.5 (+4.2, -4.0) × 10²⁰ cm^-2
z of absorber	0.94
Photon index	1.814 (+0.065, -0.064)
Flux (0.3-10 keV) (Observed)	2.85 (+0.12, -0.12) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.09 (+0.11, -0.10) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.8 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.1 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	477.02 (530)
Exposure time	9.3 ks

Late Time spectrum (T0 + 4948 to 30628 s)

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PC mode spectrum of GRB 080319B

PC mode. Mean photon arrival: T0+14470 s

N_H (Galactic)	1.1 × 10²⁰ cm^-2
N_H (intrinsic)	7.9 (+4.2, -4.0) × 10²⁰ cm^-2
z of absorber	0.94
Photon index	1.820 (+0.064, -0.064)
Flux (0.3-10 keV) (Observed)	2.94 (+0.12, -0.12) × 10^-11 erg cm^-2 s^-1
Flux (0.3-10 keV) (Unabsorbed)	3.18 (+0.11, -0.10) × 10^-11 erg cm^-2 s^-1
Counts to flux (obs)	3.8 × 10^-11 erg cm^-2 ct^-1
Counts to flux (unabs)	4.1 × 10^-11 erg cm^-2 ct^-1
C-stat (dof)	496.28 (525)
Exposure time	9.3 ks