GCN Circular 9504
A.J. van der Horst (NASA/MSFC/ORAU) and A.P. Kamble (University of Amsterdam) report on behalf of a large collaboration: "We observed the position of the GRB 090424 afterglow with the Westerbork Synthesis Radio Telescope at 2.3 GHz at May 4 19.91 UT to May 5 3.34 UT, and at 4.9 GHz at May 23 15.97 to 21.45 UT, i.e. 10.39 and 29.19 days after the burst (GCN 9223) respectively. We do not detect a radio source at the position of the optical counterpart (GCN 9223). The three-sigma rms noise in the map around that position is 168 microJy per beam at 2.3 GHz and 132 microJy per beam at 4.9 GHz. The formal flux measurement for a point source at the position of the optical counterpart is 47 +/- 56 microJy and 84 +/- 43 microJy at 2.3 and 4.9 GHz respectively. We would like to thank the WSRT staff for scheduling and obtaining these observations."