Time-dependent excitation and ionization modelling of absorption-line variability due to GRB 080310

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Volume 549 (January 2013)

A&A, 549 (2013) A22

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Table 3

Column-density evolution modelling fit results.

Incl. foreground cloud?	no	yes	yes
Incl. Littlejohns flux?	no	no	yes

(degrees of freedom)	2.51 (17)	1.50 (14)	1.69 (14)
Cloud distance^a (pc)	363 ± 86	235 ± 97	260 ± 107
Cloud size (pc)	0 ± 149	126 ± 141	55 ± 146
b_{Fe ii,Fe iii} (km s^-1)	50^b	50^b	38 ± 13
b_{Si ii,C ii} (km s^-1)	2.1 ± 0.7	1.5 ± 0.6	1.4 ± 0.5
log N(H i) (cm^-2)
log N(Fe ii) (cm^-2)
log N(Fe iii) (cm^-2)
log N(Si ii) (cm^-2)
log N(C ii) (cm^-2)
log N(Cr ii) (cm^-2)
FC^c distance^a (pc)		50^b	12 ± 8
FC^c size (pc)		39 ± 715	9 ± 19
FC^c log N(H i) (cm^-2)

Notes.

^(a)

The spectral slope and host-galaxy extinction were fixed to the values β = −0.75 and A_V = 0.19 mag, respectively. This is the distance from the GRB to the GRB-facing side of the cloud.

^(b)

Maximum allowed fit value reached.

^(c)

Foreground cloud.

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