TITLE: GCN CIRCULAR NUMBER: 6456 SUBJECT: GRB070521: NIR observations DATE: 07/05/22 20:25:19 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 localisation of GRB070521 with the MAGNUM telescope + MIPS dual-beam imager. While our observations consist of both optical and NIR images, we report here only the NIR imaging. We do not find any afterglow within the XRT error circle (GCN ##6431,6452) to the following limits (based on flux calibration with a nearby 2MASS star): Filter t - t_GRB (min) Limit (mag) J 49.2 20.7 H 106.6 20.3 K 87.1 19.2 This message may be cited.