TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4243 SUBJECT: GRB051109A - radio observations DATE: 05/11/10 10:21:05 GMT FROM: Guy Pooley at MRAO, Cambridge, UK Guy Pooley, MRAO, Cavendish Lab, University of Cambridge reports: The Ryle Telescope (Cambridge, UK) was used to map the field containing GRB051109A (GCN 4211) at 15GHz. The observation ran from 2005Nov09 12h57m to 2005Nov10 00h54m, centred 17h45m after the initial detection. No source was detected at the position of the GRB (Rykoff et al, GCN 4211; Holland et al, GCN 4235); the formal value was S = 0.40 mJy with rms noise 0.16 mJy. When the data were divided into two halves, the resulting estimates of flux density were First half (centred on 2005Nov09.75) 0.25 +- 0.23 mJy Second half (centred on 2005Nov10.25) 0.54 +- 0.23 mJy