# ALMA Detection of a Linearly Polarized Reverse Shock in GRB 190114C

@article{Laskar2019ALMADO,
title={ALMA Detection of a Linearly Polarized Reverse Shock in GRB 190114C},
author={T. Laskar and K. Alexander and R. Gill and J. Granot and E. Berger and C. Mundell and Rodolfo Barniol-Duran and J. Bolmer and P. Duffell and H. V. Eerten and W. Fong and S. Kobayashi and R. Margutti and P. Schady},
journal={arXiv: High Energy Astrophysical Phenomena},
year={2019}
}
• We present ALMA 97.5 GHz total intensity and linear polarization observations of the mm-band afterglow of GRB 190114C spanning 2.2 to 5.2 hours after the burst. We detect linear polarization at the $\approx 5\,\sigma$ level, decreasing from $\Pi=(0.87\pm0.13)\%$ to $(0.60\pm0.19)\%$, and evolving in polarization position angle from $(10\pm5)^\circ$ to $(-44\pm12)^\circ$ during the course of the observations. This represents the first detection of polarized millimeter emission in a $\gamma$-ray… CONTINUE READING