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Session: Cosmology and Relativistic Astrophysics

Name: Mr. Nikolaos Mandarakas (IA-FORTH & Univ. of Crete)
Coauthors: No coauthors were included.
Type: Poster
Title: Optical afterglow polarization of GRB210619B
Abstract:

We have measured the optical polarization of the afterglow of the extremely bright gamma-ray burst (GRB) GRB210619B in the time window ∼5967-8245 seconds post-burst, using the RoboPol polarimeter in Skinakas, Crete. We report a 5σ significant measurement of polarization P = 1.5 ± 0.3 at polarization angle EVPA = 8 ± 6°. The polarization properties remain likely constant throughout our observations. We have demonstrated that the measured polarization is intrinsic to the GRB, as the host-induced polarization and the polarization induced by the interstellar are relatively negligible.