Fig. 1: Radio light curves of GRB 22109A between 3 and 18 GHz.
From: Precise measurements of self-absorbed rising reverse shock emission from gamma-ray burst 221009A
Left: AMI-LA observations of GRB 221009A for the first 5 d after the burst. Due to the high flux density in the first observation (between T0 + 3.1 h and T0 + 7.1 h) we are able to split the data into 15 min time bins for each of the eight quick-look spectral windows and derive flux density values directly from the complex visibilities. After the first day we derive fluxes from the image plane, using the top and bottom halves of the AMI-LA observing band to monitor any spectral index evolution. See Methods for details of the data reduction process. Right: ATA observations of GRB 221009A for the first 5 d after the burst showing an early-time peak most evident at 3 and 5 GHz (and tentatively seen at 8 GHz). All flux densities are derived from the image plane; see Methods for details of the data reduction process and imaging creation and processing. Error bars represent 1σ uncertainties.
