TITLE: GCN CIRCULAR NUMBER: 11098 SUBJECT: GRB 100814A: Submm observations from APEX DATE: 10/08/15 12:02:52 GMT FROM: Antonio Deugarte at IAA-CSIC A. de Ugarte Postigo (INAF-OAB, DARK/NBI), C. de Breuck, A.J. Castro-Tirado (IAA-CSIC), G. Siringo, F.M. Montenegro-Montes, M. Martinez (APEX), A. Hacar (OAN), T. Stanke, A. Lundgren, M. Dumke (ESO) report on behalf of a larger collaboration: "We have observed the field of GRB 100418A (Beardmore et al. GCNC 11087) using LABOCA/APEX at Chajnantor (Chile) in the 345 GHz band. Observations began on 15th August at 05:39 UT (25.8 hours after the burst onset). In a preliminary analysis we do not detect any new source at the position of the afterglow (Schaefer et al. GCNC 11086, De Pasquale et al. GCNC 11095) down to a 3-sigma limit of 5.4 mJy. The formal flux density at the position of the afterglow is 4.6+/-1.8 mJy."