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Table 3

Overview of the quality of fit results.

SMC LMC MW Best model

GRB Phot Spec

100219A 3.8/10 41.7/30 4.3/10 34.8/30 6.9/10 44.2/30 MW LMC
100418A 11.2/12 20.8/23 10.7/12 20.2/23 11.1/12 20.0/23 Any SMC
100814A 48.1/33 70.8/66 47.8/33 71.0/66 47.9/33 257/67 Any SMC
100901A 15.4/26 44.2/41 14.8/26 160/47 14.6/26 355/47 Any SMC
120119A 59.7/47 194.1/81 57.5/47 106.0/81 79.5/47 1023/81 SMC/LMC LMC
120815A 21.3/21 26.0/47 22.2/21 122.9/47 20.0/22 353.1/27 Any SMC
130427A 62.6/64 129.3/147 62.5/64 130.0/147 62.5/64 123.9/147 Any SMC
130603B 11.5/9 21.3/23 11.1/9 20.9/23 10.6/9 21.2/23 Any SMC
130606Aa 15.9/18 48.8/31 16.0/18 48.8/31 16.0/18 48.8/31 Any Any

Notes. Results of the fits to the broadband SEDs where photometry (phot) and X-Shooter spectrum (spec) is used to build the NIR-to-UV part. Here we focus on the extinction curve component of the models. For each model we report the χ2/d.o.f.; here we only consider models where Δβ and NHI are left as free parameters (see Table A.1 for details and other models). The last two columns show whether a certain extinction curve is found to be preferential over the other two. In the X-Shooter case, the better coverage of the blue part of the optical SED sometimes allows us to distinguish between models even if their fits are of a similar quality according to the χ2 (see Sect. 4.1): these models are marked with .


The case of GRB 130606A is found to have AV ~ 0.

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