TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3655 SUBJECT: GRB 050721a: Optical Observations DATE: 05/07/21 06:25:56 GMT FROM: Ken ichi Torii at RIKEN K. Torii (Osaka U.) reports: "The error region of the Swift GRB 050721a (Antonelli et al. GCN 3654) was imaged with the 0.3 m telescope in the New Mexico Skies observatory. The observation started at 2005 July 21, 04:35:23 UT (369 s after the trigger) and several 120 s integrations in I band were obtained. We identify a bright (I~15 mag) fading object whose position is consistent with the XRT afterglow candidate reported in GCN 3654. However, this source does not seem to be spatially resolved with a nearby 2MASS star in our frames. Further observations and analyses are in progress."