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Table A.1

Fitting results.

X-Shooter only/XRT only/broadband photometric X-Shooter & XRT
GRB Extinction NH,X β1 β2 νbreaka log NHI(Lyα) Av χ2/d.o.f. NH β1 β2 νbreaka log NHI(Lyα) Av χ2/d.o.f.
[1022 cm-2] [1015 Hz] log  cm-2 [1022 cm-2] [1015 Hz] log  cm-2
100219A SMC 0.46 20.9 0.21 37.0/21 <5.9 0.71 21.0 0.15 41.7/30
LMC 0.49 20.9 0.32 30.1/21 <6.2 0.73 21.0 0.23 34.8/30
MW 0.73 20.9 0.43 44.0/21 <4.3 0.77 20.9 0.40 44.2/30
SMCf 0.53 21.14 0.18 44.5/22 <5.8 0.71 21.14 0.14 47.7/31
LMCf 0.58 21.14 0.27 39.4/22 <6.1 0.72 21.14 0.22 42.4/31
MWf 0.99 21.14 0.23 42.3/22 <5.7 0.76 21.14 0.39 55.5/31
XRT <5.9 0.57 2.2/7
SMCp <5.5 0.69 0.11 3.8/10
LMCp <5.6 0.70 0.16 4.3/10
MWp <5.8 0.72 0.25 6.9/10
100418A SMC 0.50 0.52 24.0/16 0.14 0.73 1.04 0.6 0.20 20.8/23
LMC 0.50 0.56 33.8/16 0.14 0.72 1.05 0.6 0.22 20.2/23
MW 0.65 0.44 45.8/16 0.13 0.73 1.05 0.6 0.21 20.0/23
XRT <0.3 0.85 6.3/7
SMCp 0.13 0.78 1.01 1.0 0.27 11.2/12
LMCp 0.13 0.77 1.02 1.1 0.30 10.7/12
MWp 0.14 0.79 1.02 1.1 0.29 11.1/12
100814A SMC 0.52 0.20 25.5/38 0.35 0.52 1.05 2.3 0.20 70.8/66
LMC 0.49 0.29 111.7/38 0.30 0.58 1.99 1.3 0.16 71.0/66
MW 0.99 0.0 187.1/38 0.19 0.94 0.02 257/68
XRT 0.21 0.87 42.8/28
SMCp 0.37 0.65 0.86 1.7 0.10 48.1/33
LMCp 0.37 0.60 0.88 1.7 0.15 47.8/33
MWp 0.37 0.60 0.88 1.7 0.16 47.9/33
100901A SMC 0.26 0.39 18.8/18 0.25 0.50 1.06 5.8 0.29 44.2/41
LMC 0.81 0.18 147.2/18 0.26 0.81 1.10 150.8 0.21 160.0/41
MW 1.18 0.0 169.2/18 <1.5 0.93 1.20 15 000 0.15 355.0/41
XRT < 0.6 1.10 18.9/23
SMCp 0.60 0.71 1.23 34.9 0.19 15.4/26
LMCp 0.61 0.73 1.23 29.0 0.28 14.8/26
MWp 0.58 0.72 1.20 17.5 0.38 14.6/26
120119A SMC 1.61 23.1 0.50 58.1/34 1.78 0.86 23.7 0.88 194.1/81
LMC 1.50 23.3 0.67 62.9/34 1.98 0.89 23.4 1.07 106.0/81
MW 2.57 23.8 0.01 311.0/34 1.75 0.92 23.8 1.26 1023/81
SMCf 1.57 22.5 0.53 87.1/35 1.79 0.86 22.5 0.88 182.5/82
LMCf 1.18 22.5 0.92 96.9/35 2.01 0.89 22.5 1.10 126.3/82
MWf 2.60 22.5 0.01 331.0/35 1.75 0.93 22.5 1.31 1268/82
XRT 1.15 0.60 31.6/45
SMCp 2.07 0.86 0.93 59.7/47
LMCp 2.11 0.88 1.01 57.5/47
MWp 2.11 0.88 1.03 79.5/47
120815A SMC 0.49 1.11 1.4 22.3 0.26 17.7/27 0.66 0.38 0.84 1.4 22.3 0.32 26.0/47
LMC 0.71 1.94 1.4 22.3 014 17.5/27 0.52 0.48 0.84 1.3 23.0 0.35 122.9/47
MW 0.76 2.29 1.4 22.3 0.10 17.7/27 0.22 0.57 0.79 0.8 23.6 0.15 353.1/27
SMCf 0.40 0.93 1.4 22.1 0.30 19.8/28 0.66 0.36 0.84 1.4 22.1 0.32 27.5/48
LMCf 0.66 1.95 1.4 22.1 0.17 20.1/28 0.58 0.33 0.88 1.3 22.1 0.43 118.8/48
MWf 0.72 2.35 1.4 22.1 0.11 20.2/28 0.0 0.29 0.93 1.1 22.1 0.42 800.2/48
XRT < 0.8 0.60 17.5/18
SMCp 0.52 0.40 0.78 0.9 0.16 21.3/21
LMCp 0.52 0.47 0.78 1.0 0.16 22.2/21
MWp 0.48 0.76 0.10 20.0/22
130427A SMC 0.43 0.79 0.7 < 0.26 31.7/58 0.08 0.37 0.68 0.7 0.16 129.3/147
LMC 0.43 0.80 0.7 < 0.29 31.6/58 0.11 0.05 0.77 1.0 0.54 130.0/147
MW 0.43 0.80 0.7 < 0.21 31.6/58 0.12 0.03 0.81 1.3 0.59 123.9/147
XRT 0.10 0.73 88.9/87
SMCp 0.10 0.33 0.73 1.6 0.20 89.2/91
LMCp 0.10 0.31 0.73 1.4 0.23 89.2/91
MWp 0.10 0.31 0.73 1.4 0.24 89.2/91
130603B SMC 0.30 0.80 0.9 1.33 14.6/15 0.20 0.42 0.92 0.8 1.19 21.3/23
LMC 0.24 0.86 0.7 1.40 13.6/15 0.21 0.30 0.95 0.7 1.33 20.9/23
MW 0.24 0.78 0.7 1.45 14.3/15 0.21 0.31 0.94 0.6 1.36 21.2/23
XRT < 0.3 0.71 6.1/6
SMCp 0.17 0.31 0.86 0.5 0.81 11.5/9
LMCp 0.18 0.28 0.86 0.5 0.83 11.1/9
MW p 0.18 0.27 0.86 0.5 0.88 10.6/9
130606A SMC 0.93 19.1 0.0 28.1/14 <3.5 0.96 19.9 <0.01 48.8/31
LMC 0.94 19.1 0.0 28.6/14 <3.5 0.96 19.9 <0.01 48.8/31
MW 0.94 19.1 0.0 28.4/14 <3.5 0.96 19.9 <0.01 48.8/31
SMCf 0.92 19.94 0.0 33.7/15 <3.4 0.96 19.94 <0.01 50.1/32
LMCf 0.92 19.94 0.0 33.6/15 <3.4 0.96 19.94 <0.01 50.1/32
MWf 0.93 19.94 0.0 33.8/15 <3.4 0.96 19.94 <0.01 50.1/32
XRT < 2.2 0.77 13.3/15
SMCp <3.6 0.96 <0.1 15.9/18
LMCp <3.6 0.96 <0.1 16.0/18
MWp <3.6 0.96 <0.2 16.0/18

Notes. We do not report errors in cases with high values of reduced χ2, for which the procedure for measuring errors could not be safely applied. For each GRB, we first fit only the optical (X-Shooter) part using different extinction profiles. Then we repeat the fitting by including the X-ray data into the fit and compare the results. For each modelled extinction curve we report the best result i.e. power law or broken power-law model. Since including the neutral hydrogen column density as a free parameter in the fit may represent an uncertain element that could significantly affect the results, we also show the fits in which NHI is taken from the literature. These are marked with f. In addition, we report the best fit to the XRT SED and to the broadband SED with photometric optical data points. The latter are marked with letter p. XRT-only SEDs are always fitted best with a single power-law model.

(a)

Host rest-frame value.

(p)

Broadband fit using photometric measurements.

(f)

Fit in which neutral hydrogen column density has been fixed to the value measured from the literature.

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