TITLE: GCN CIRCULAR NUMBER: 6455 SUBJECT: GRB070520B: NIR observations DATE: 07/05/22 20:18:56 GMT FROM: Paul Price at IfA,UH T. Minezaki (IoA, Tokyo) and P.A. Price (IfA, Hawaii) report on behalf of a larger collaboration: We observed the position of GRB 070520B with the MAGNUM telescope + MIPS dual-beam imager in R and J bands, at a mean observation time of 12.69 hours after the BAT trigger (GCN #6425). We have only inspected the J-band images, since other reports have covered the optical (GCN ##6442,6447). We find no afterglow within the XRT error circle to a limit of J = 20.1 mag. This message may be cited.