GCN Circular 9883
A.J. van der Horst (NASA/MSFC/ORAU) A.P. Kamble, R.A.M.J. Wijers (U of Amsterdam) and C. Kouveliotou (NASA/MSFC) report on behalf of a large collaboration: "We observed the position of the GRB 090902B afterglow with the Westerbork Synthesis Radio Telescope at 4.8 GHz at September 3 12.72 UT to September 4 0.35 UT, i.e. 1.07 - 1.55 days after the burst (GCN 9866). We detect a radio source at the 4-sigma level with a flux density of 111 +/- 28 microJy at the position of the optical counterpart (GCN 9869, GCN 9874). We would like to thank the WSRT staff for scheduling and obtaining these observations."