Late-Time Observations of the Ultraluminoius GRB 221009A

Gamma-ray burst GRB 221009A was the brightest-ever observed long GRB and was the focus of several observing programs, including those on HST and JWST. Early observations showed a fading of the transient consistent with that of a GRB afterglow and no observed jet-break, leading to the conclusion that this happened at extremely early times (or is yet to occur). A supernova component was detected in JWST NIRSPEC spectroscopy, however the supernova was found to be normal-to-low luminosity for standard GRB-SNe adding further complication to our understanding of the GRB-SN connection. Early JWST observations also showed an extremely low metallicity of the host galaxy (low even for GRB host galaxies) and strong H₂ emission at the location of the transient, which is consistent with recent star-formation. In this talk, I present optical and NIR imaging of the host galaxy and afterglow of this GRB from HST and JWST extending to 362 days post-burst. The source is still detected in all epochs. With these observations, my team and I will constrain the presence of a late jet break, the afterglow light curve and SED, and the model of the host galaxy.