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The ROTSE-IIIa telescope at Siding Spring Observatory, Australia, detectedprompt optical emission from Swift GRB 050401. In this letter, we presentobservations of the early optical afterglow, first detected by the ROTSE-IIIatelescope 33 s after the start of gamma-ray emission, contemporaneous with thebrightest peak of this emission. This GRB was neither exceptionally long norbright. This is the first prompt optical detection of a GRB of typical durationand luminosity. We find that the early afterglow decay does not deviatesignificantly from the power-law decay observable at later times, and isuncorrelated with the prompt gamma-ray emission. We compare this detection withthe other two GRBs with prompt observations, GRB 990123 and GRB 041219a. Allthree bursts exhibit quite different behavior at early times.Comment: 4 pages, 3 figures. Accepted for publication in ApJ Letter

Prompt Optical Detection of GRB 050401 with ROTSE-IIIa