TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4266 SUBJECT: GRB051103: Radio Observations DATE: 05/11/12 00:01:27 GMT FROM: Patrick B. Cameron at Caltech P. Brian Cameron (Caltech) and Dale A. Frail (NRAO) report on behalf of a larger collaboration: "We observed the field of GRB 051103 (GCN 4197) with the Very Large Array (VLA) at a frequency of 1.4 GHz beginning November 6.3 UT. We imaged the entire IPN error region with three VLA pointings. We found no new sources to the limit of the NRAO VLA Sky Survey (NVSS, Condon et al., ApJS, 117, 361). The rms noise varied from 0.5 mJy at the southern edge of the IPN error box, to 1.5 mJy at the northern end (due to residual flux from M82). We also observed a 5-arcmin radius around M82 on November 8.45 UT at a frequency of 4.86 GHz. A comparison between this image and the the NVSS image of the same region did not reveal any new sources above 1.5 mJy (3-sigma). No further observations are planned. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."