Spectrophotometric analysis of gamma-ray burst afterglow extinction curves with X-Shooter

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Table 2

Results of the best-fit models of the broadband SEDs.

GRB	Extinction	N_H,X	β₁	β₂	ν_break^a	log N_HI(Lyα)	A_v	χ²/d.o.f.
	type	[10²² cm^-2]			[10¹⁵ Hz]	log cm^-2

100219A	LMC	<6.2	0.73			21.0	0.23	34.8/30
100418A	SMC	0.14	0.73	1.04	0.6		0.20	20.8/23
100814A	SMC	0.35	0.52	1.05	2.3		0.20	70.8/66
100901A	SMC	0.25	0.50	1.06	5.8		0.29	44.2/41
120119A	LMC	1.98	0.89			23.4	1.07	106.0/81
120815A	SMC	0.66	0.38	0.84	1.4	22.3	0.32	26.0/47
130427A	SMC	0.08	0.37	0.68	0.7		0.16	129.3/147
130603B	SMC	0.20	0.42	0.92	0.8		1.19	21.3/23
130606A^b	/	<3.5	0.96			19.9	<0.01	48.8/31

Notes.Detailed summary of the fitting results is outlined in Table A.1 and discussed in Sect. 3.

^(a)

Host rest-frame value.

^(b)

GRB 130606A is found to be consistent with A_V ~ 0, therefore no extinction curve is needed for modelling.

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