Polarimetry of GRB 230818A

Bernardes, D, Steele, I ORCID: 0000-0001-8397-5759, Jermak, H ORCID: 0000-0002-1197-8501 and McCall, C ORCID: 0000-0002-3375-3397 (2024) Polarimetry of GRB 230818A. Research Notes of the AAS, 8 (3).

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Abstract

We present a preliminary analysis of optical photometric and polarimetric observations of GRB 230818A obtained with the Liverpool Telescope starting 3.2 minutes after the alert. The optical photometry suggests a reverse shock-dominated afterglow, transitioning to forward shock at around 15 minutes. The polarization shows a low degree (upper limit 6%) early in the light curve. This is in contrast to the expected result since this regime should be dominated by the reverse shock wave that, in turn, should present a higher degree of polarization.

Item Type:	Article
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	American Astronomical Society
Date of acceptance:	1 March 2024
Date Deposited:	13 Nov 2024 15:39
Last Modified:	03 Jul 2025 12:40
DOI or ID number:	10.3847/2515-5172/ad3557
URI:	https://researchonline.ljmu.ac.uk/id/eprint/24770

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