TITLE: GCN CIRCULAR NUMBER: 14055 SUBJECT: GRB 121209A: CARMA 3mm Observations DATE: 12/12/11 06:05:41 GMT FROM: Ashley Zauderer at CfA A. Zauderer, T. Laskar, W. Fong, and E. Berger (Harvard) report on behalf of the CARMA Key Project "A Millimeter View of the Transient Universe": "We observed the position of GRB 121209A (Maselli et al.; GCN 14045) with the Combined Array for Research in Millimeter Astronomy beginning 2012 Dec 10.93 (dt=1.0 d) at a mean frequency of ~85 GHz. We do not detect significant millimeter emission at the enhanced Swift/XRT error circle (Goad et al.; GCN 14051) or at the position of the GROND optical afterglow candidate (Kruehler et al.; GCN 14049) to a 3-sigma limit of 0.5 mJy. We thank the CARMA observers and staff for their support."