TITLE: GCN CIRCULAR NUMBER: 10611 SUBJECT: GRB 100413A: Radio Afterglow Detection with the EVLA DATE: 10/04/17 23:59:34 GMT FROM: Derek Fox at PSU Dale A. Frail (NRAO) and Derek Fox (PSU) report on behalf of a larger collaboration: "We used the Expanded Very Large Array (EVLA) to observe the localization of the Swift burst GRB 100413A (Trigger #419404; Holland et al., GCN 10581), an X-ray bright event without any optical or NIR counterpart to deep limits (Xin et al., GCN 10583; Updike et al., GCN 10587; Guidorzi et al., GCN 10589; Filgas et al., GCN 10592). Within the revised XRT error circle (Goad et al., GCN 10584) we detect a single 8.5 GHz radio source with flux density 159 +/- 15 uJy and position R.A. 17:44:53.16, Dec. +15:50:03.2 (J2000), with 1-sigma astrometric uncertainty of +/-0.6 arcsec. The EVLA is undergoing active commissioning and as such these results should be considered preliminary. 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."