{
  "bibcode": "2009GCN..9504....1V",
  "body": "A.J. van der Horst (NASA/MSFC/ORAU) and A.P. Kamble (University of\nAmsterdam) report on behalf of a large collaboration:\n\n\"We observed the position of the GRB 090424 afterglow with the Westerbork\nSynthesis Radio Telescope at 2.3 GHz at May 4 19.91 UT to May 5 3.34 UT,\nand at 4.9 GHz at May 23 15.97 to 21.45 UT, i.e. 10.39 and 29.19 days\nafter the burst (GCN 9223) respectively.\nWe do not detect a radio source at the position of the optical counterpart\n(GCN 9223). The three-sigma rms noise in the map around that position is\n168 microJy per beam at 2.3 GHz and 132 microJy per beam at 4.9 GHz. The\nformal flux measurement for a point source at the position of the optical\ncounterpart is 47 +/- 56 microJy and 84 +/- 43 microJy at 2.3 and 4.9 GHz\nrespectively.\n\nWe would like to thank the WSRT staff for scheduling and obtaining these\nobservations.\"",
  "circularId": 9504,
  "createdOn": 1244779208000,
  "email": "Alexander.J.VanDerHorst@nasa.gov",
  "subject": "GRB 090424: WSRT Radio Observations",
  "submitter": "Alexander van der Horst at NASA/MSFC  <Alexander.J.VanDerHorst@nasa.gov>",
  "eventId": "GRB 090424"
}