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About

A. C. Foster is an observational astrophysicist whose career has been defined by pioneering robotic telescope systems and the rapid capture of gamma-ray burst (GRB) afterglows. Foster’s primary research areas include time-domain astronomy, robotic optical monitoring, and multiwavelength polarimetry of transient phenomena. Their most significant contribution is the conception and construction of the PROMPT (Panchromatic Robotic Optical Monitoring and Polarimetry Telescopes) array at Cerro Tololo Inter-American Observatory. Funded by $1.2M in grants and donations, this system of six rapidly slewing 0.41-meter telescopes can respond to GRB alerts within seconds, capturing afterglows at their brightest. Foster’s work on GRB 060607A produced a densely sampled multiwavelength light curve beginning tens of seconds post-burst, providing unprecedented early-time data. With over 120 citations across their top papers, Foster’s impact extends to developing novel single-dish radio mapping algorithms that improve contaminant cleaning and small-scale structure photometry. Their work has fundamentally advanced our ability to study the universe’s most violent explosions in real time, making Foster a key figure in robotic transient astronomy.