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Closing in on a Short‐Hard Burst Progenitor: Constraints from Early‐Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b

Closing in on a Short‐Hard Burst Progenitor: Constraints from Early‐Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b

The localization of the short-duration, hard-spectrum GRB 050509b was a watershed event. Thanks to the nearly immediate relay of the GRB position by Swift, we began imaging the GRB field 8 minutes after the burst and continued for the following 8 days. No convincing optical/infrared candidate afterglow or supernova was …