The brightest GRB ever detected: GRB 221009A as a highly luminous event at z = 0.151

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Table 3.

Fluxes of the host emission lines measured in the X-shooter spectrum from October 20.

Line	Observed wavelength	Observed flux	Corrected flux (MW)	Corrected flux (MW + host)
	(Å)	(10⁻¹⁷ erg s⁻¹ cm⁻²)	(10⁻¹⁷ erg s⁻¹ cm⁻²)	(10⁻¹⁷ erg s⁻¹ cm⁻²)
Hα	7553.80	$3 . 4_{- 0.2}^{+ 0.2}$ $3.4^{+0.2}_{-0.2}$	$39 . 0_{- 2.0}^{+ 2.0}$ $39.0^{+2.0}_{-2.0}$	$51 . 0_{- 5.6}^{+ 5.7}$ $51.0^{+5.7}_{-5.6}$
Paα	21 582.75	$3 . 9_{- 0.4}^{+ 0.4}$ $3.9^{+0.4}_{-0.4}$	$5 . 7_{- 0.5}^{+ 0.5}$ $5.7^{+0.5}_{-0.5}$	$6 . 0_{- 0.7}^{+ 0.7}$ $6.0^{+0.7}_{-0.7}$
[N II] λ6584	–	< 0.4	< 4.0	< 5.3

Notes. The last two columns report the line fluxes corrected for the MW extinction (A_V = 4.177 mag) and MW + host, respectively.

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