The most distant optically polarised GRB afterglow: GRB 240419A at z = 5.178

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Table 2.

Results of GRB 240419A optical afterglow polarimetric observations.

t − t₀ [s]	Q/I	U/I	P [%]	θ [°]
1740	−0.071 ± 0.016	0.008 ± 0.015	6.971 $_{- 1.519}^{+ 1.835}$ $^{+1.835}_{-1.519}$	86.98 ± 5.92
2259	−0.041 ± 0.011	0.023 ± 0.014	4.577 $_{- 1.083}^{+ 1.306}$ $^{+1.306}_{-1.083}$	75.61 ± 8.04
3059	−0.039 ± 0.015	0.032 ± 0.018	4.813 $_{- 1.529}^{+ 1.868}$ $^{+1.868}_{-1.529}$	70.20 ± 9.50

Notes. Summary of the results for imaging polarimetry frames analysis. Errors on the reduced Stokes parameters and the position angle were computed via propagation theory; those on P were obtained after bias correction when appropriate (see Sect. 3.3). Uncertainties are at 1σ level.

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