TITLE: GCN CIRCULAR NUMBER: 17554 SUBJECT: GRB 150309A: BOOTES-1 and -2 upper limit DATE: 15/03/10 00:13:17 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia R. Cunniffe, M. Jelinek, Y. Hu, S. Jeong, S. R. Oates (IAA-CSIC), B.-B. Zhang (IAA-CSIC and UAH) and A. J. Castro-Tirado (IAA-CSIC and ISA-UMA), on behalf of a larger collaboration, report: Both the 60 cm BOOTES-2/TELMA and the 30 cm BOOTES-1 robotic telescopes in South Spain automatically responded to the Swift trigger of GRB 150309A (Cummings et al., GCN 17553). The first exposure started at 23:04:33 UT (86s after the trigger) and a sequence of 20 images was obtained (3s each, clear filter). A median combined image revealed no optical counterpart at the enhanced XRT error circle down to 18 mag. Further observations are ongoing. [GCN OPS NOTE(10mar15): Per author's request, the affilliation of B-BZ was changed.]