AT2019pim: A Luminous Orphan Afterglow from a Moderately Relativistic
Outflow
AT2019pim: A Luminous Orphan Afterglow from a Moderately Relativistic
Outflow
Classical gamma-ray bursts (GRBs) have two distinct emission episodes: prompt emission from ultra-relativistic ejecta and afterglow from shocked circumstellar material. While both components are extremely luminous in known GRBs, a variety of scenarios predict the existence of luminous afterglow emission with little or no associated high-energy prompt emission. We present …