Early photometric and spectroscopic observations of the extraordinarily bright INTEGRAL-detected GRB 221009A

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Table 3.

Absorption line measurements from the OSIRIS afterglow spectrum.

Feature	λ_obs [Å] ^(a)	z	EW_rest [Å] ^(b)	EW_lGRB [Å] ^(c)
CaIIλ3935	4527.26 ± 0.37	0.1505756	1.78 ± 0.14	1.29 ± 0.31
CaIIλ3970	4566.69 ± 0.13	0.1504186	0.87 ± 0.10	0.93 ± 0.34
NaID ^(d)	6780.75 ± 0.27	0.1503387	0.38 ± 0.04	–

Notes.

^(a)

λ_obs is the centroid of the line computed from a Gaussian fit.

^(b)

EW_rest represents the equivalent widths calculated at the rest frame.

^(c)

EW_lGRB is the average equivalent width typically observed in afterglow spectra of lGRBs (de Ugarte Postigo et al. 2012).

^(d)

NaID denotes the blending of NaIλ5892 and NaIλ5898, which is not resolved in our spectra.

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