GCN Circular 11090
J. Gorosabel (IAA-CSIC), S. Rodriguez LLano (IAC), A.J. Castro-Tirado (IAA-CSIC), report on behalf of a larger collaboration: "Following the detection of GRB 100814A by Swift (Beardmore et al. GCNC 11087) we have acquired a series of R-band images with the 0.82-m IAC80 telescope at Observatory of Teide, Tenerife, Spain. The first exposure started on Aug 14.1788 UT (~27.3 minutes post burst). The optical afterglow (Schaefer et al. GCNC 11086; Gronwall et al. GCN 11088) is detected with a preliminary magnitude of R~18.7, assuming a magnitude of R=16.87 for the USNO-B1.0 star placed at RA(J2000)=01:29:43.606, DEC(J2000)=-18:00:38.61."