| Issue |
A&A
Volume 670, February 2023
|
|
|---|---|---|
| Article Number | A144 | |
| Number of page(s) | 5 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202244802 | |
| Published online | 17 February 2023 | |
GRB 210619B optical afterglow polarization
1
Institute of Astrophysics, Foundation for Research and Technology – Hellas, 100 Nikolaou Plastira str. Vassilika Vouton, 70013 Heraklion, Crete, Greece
2
Department of Physics, University of Crete, Vasilika Bouton, 70013 Heraklion, Greece
e-mail: nmandarakas@physics.uoc.gr
3
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
Received:
24
August
2022
Accepted:
13
December
2022
Aims. We report on the follow-up of the extremely bright long gamma-ray burst (GRB) GRB 210619B with optical polarimetry.
Methods. We conducted optopolarimetric observations of the optical afterglow of GRB 210619B in the SDSS-r band in the time window ∼5967 − 8245 s after the burst, using the RoboPol instrument at the Skinakas observatory.
Results. We report a 5σ detection of polarization P = 1.5 ± 0.3 at polarization angle EVPA = 8 ± 6°. We find that during our observations, the polarization is likely constant. These values have been corrected for polarization induced by the interstellar medium of the Milky Way and host-induced polarization is likely negligible. Thus the polarization we quote is intrinsic to the GRB afterglow.
Key words: polarization / relativistic processes / methods: observational / techniques: polarimetric / gamma-ray burst: individual: GRB210619B / gamma rays: stars
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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