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Table 1.

Polarization of field stars corrected for instrumental polarization and their weighted mean together with the optical ISP derived from Planck using two different resolutions, 30′ and 15′, as well as the weighted mean and errors on the mean of the first five GRB measurements.

Star ID RA Dec Dist. r Q/I U/I
deg deg kpc mag % %
Field Star 1 319.7258658 33.8492013 4.3 13.85 0.34 ± 0.15 0.11 ± 0.05
Field Star 2 319.7152985 33.8603076 4.2 13.90 0.30 ± 0.10 0.08 ± 0.16
Field Star 3 319.7351566 33.8638350 3.2 15.7 0.25 ± 0.06 −0.12 ± 0.11

Weighted Mean 0.25 ± 0.04 0.07 ± 0.13

Planck 30′ 319.71831 33.85044 0.16 ± 0.02 0.19 ± 0.02
Planck 15′ 319.71831 33.85044 0.25 ± 0.02 0.11 ± 0.02

GRB 319.71831 33.85044 1.50 ± 0.31 0.46 ± 0.28

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