TITLE: GCN CIRCULAR NUMBER: 12002 SUBJECT: GRB 110503A: Millimeter observation from SMA DATE: 11/05/04 22:25:52 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (DARK/NBI), G. Petitpas (SMA) and S. Martin (ESO) report on behalf of a larger collaboration: We have observed the afterglow of GRB 110503A (Stamatikos et al. GCNC11991) with the Submillimeter Array (SMA, Hawaii, U.S.A.). Observations were performed at 217GHz (1.4 mm) using 5 antennas under unstable weather conditions (optical depth at 225 GHz ~0.25, humidity ~50%). The GRB field was observed for 268 minutes (on-source), starting at 1:15 UT, with mean epoch on 4 May at 5:36 UT, 12.0 hours after the burst. We do not detect any significant flux at the position of the optical afterglow, imposing a 3-sigma detection limit of 5.1 mJy. [GCN OPS NOTE(05may11): Per author's request, the burst name in the Subject-line was corrected.]