TITLE: GCN CIRCULAR NUMBER: 11131 SUBJECT: EVLA radio afterglow detection of GRB 100814A DATE: 10/08/19 23:45:19 GMT FROM: Poonam Chandra at Royal Mil. College Canada Poonam Chandra (RMC), Dale A. Frail (NRAO) and S. Bradley Cenko (Berkeley) report on behalf of a larger collaboration: "We observed the localization of GRB 100814A (Beardmore et al. GCN 11087) with the Expanded Very Large Array (EVLA) on August 18.38 UT at a C band wide receiver (receiver frequency range 4-8 GHz). We detect the radio afterglow of the GRB at the Swift-XRT position (Beardmore et al. GCN 11092) at 4.5 and 7.9 GHz frequencies. The flux densities at 4.5 and 7.9 GHz bands are 198+/-29 uJy and 453+/-23 uJy, respectively. The EVLA is still undergoing active commissioning and we caution that these results should be considered preliminary. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc."