TITLE: GCN CIRCULAR NUMBER: 10785 SUBJECT: GRB 100522A: BOOTES-2 optical limit DATE: 10/05/22 05:24:50 GMT FROM: Martin Jelinek at Inst.Astrophys.Andalucia,Granada M. Jel�nek (IAA-CSIC Granada), P. Kub�nek (IPL Valencia, IAA-CSIC) and A. J. Castro-Tirado (IAA-CSIC), on behalf of a larger collaboration, report: "The 0.6m TELMA robotic telescope at the BOOTES-2 astronomical station in M�laga (Spain) reacted to the Swift GRB 100522A (Troja et al., GCNC10784), starting 10m25s after the trigger (15s after receiving the delayed trigger). A set of 10s unfiltered images was obtained, however the progressing twillight degraded the images (already taken at high airmass). The 120s coadded image with an exposure mean time 735s after the GRB provides a limit R>15.5 at the XRT position reported by Troja et al." This message can be quoted.