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About

J. Aceituno is an observational astrophysicist whose work has significantly advanced our understanding of gamma-ray bursts (GRBs) and night-sky quality monitoring. Their most impactful contribution came from the 1999 study of GRB 990123, which provided critical broad-band ultraviolet-to-near-infrared observations of the afterglow starting just 8.5 hours post-burst. This work, cited over 110 times, offered key constraints on the fireball model of GRBs, helping to shape the theoretical framework for these extreme cosmic explosions. Aceituno also pioneered ground-based astronomical instrumentation with the development of the All-Sky Transmission Monitor (ASTMON), a system for continuous, multi-band measurement of night-sky brightness and atmospheric extinction. This 2011 paper, with 42 citations, has become a foundational tool for observatory site characterization and light-pollution studies, enabling precise calibration for wide-field surveys. By bridging high-energy transient astrophysics with practical sky-monitoring technology, Aceituno has made lasting contributions to both cutting-edge GRB research and the operational infrastructure of modern astronomy.