TITLE: GCN CIRCULAR NUMBER: 5874 SUBJECT: GRB 061121: Second Epoch ATCA Radio Observations DATE: 06/11/28 00:26:09 GMT FROM: Alexander van der Horst at U of Amsterdam A.J. van der Horst, R.A.M.J. Wijers (University of Amsterdam) and E. Rol (University of Leicester) report on behalf of a larger collaboration: "We reobserved the position of the GRB 061121 afterglow at 4.8 and 8.6 GHz with the Australia Telescope Compact Array at November 27 14.11 UT to 20.88 UT, i.e. 5.95 - 6.23 days after the burst (GCN 5823). We do not detect a radio source at the position of the optical afterglow (GCN 5824). The three-sigma rms noise in het map around that position is 126 microJy per beam at 4.8 GHz, and 129 microJy per beam at 8.6 GHz. The formal flux measurement for a point source at the location of the optical afterglow is 7 +/- 42 microJy at 4.8 GHz, and -20 +/- 43 microJy at 8.6 GHz. We would like to thank the staff of the Australia Telescope National Facility, in particular Philip Edwards, for obtaining these Target of Opportunity observations."