TITLE: GCN CIRCULAR NUMBER: 13927 SUBJECT: GRB 121028A: near-IR observations at Calar Alto DATE: 12/10/29 20:15:14 GMT FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia M. Jelinek, A. J. Castro-Tirado (IAA-CSIC Granada), P. Ferrero (IAC Tenerife), S. Guziy (Univ. of Nikolaev) and G. Bergond (CAHA Almer�a), on behalf of a larger collaboration, report: "Following the detection of GRB 121028A by Swift (Starling et al. GCNC 13913), we triggered the 3.5m CAHA telescope (+ Omega 2000) at the German-Spanish Calar Alto Observatory. Observations (900s each) were taken in the YJHK-bands, starting at 18:05 UT (i.e. 13 hr post burst). At the position of the X-ray afterglow (Evans et al. GCNC 13918), we do not detect a near-IR countepart in any band, particularly down to H = 20.5." This message can be quoted. [GCN OPS NOTE(30oct12): Per author's request, PF was added to the author list.]