James Webb Space Telescope Feed Post

JWST detection of heavy neutron capture elements in a compact object merger

JWST images of GRB 230307A at 28.5 days post burst. The upper panel shows the wide field image combining the F115W, F150W and F444W images. The putative host is the bright face-on spiral galaxy, while the afterglow appears at a 30-arcsecond offset, within the white box. The lower panel shows cut-outs of the NIRCAM data around the GRB afterglow location. The source is faint and barely detected in the bluer bands but very bright and well detected in the red. In the red bands, a faint galaxy is present northeast of the transient position. This galaxy has a redshift of z = 3.87, but we consider it to be a background object unrelated to the GRB.