TITLE: GCN CIRCULAR NUMBER: 18235 SUBJECT: GRB 150831A: 9.8 GHz VLA upper limits DATE: 15/09/04 00:16:23 GMT FROM: Wen-fai Fong at U of Arizona W. Fong (U. Arizona) and B. A. Zauderer (Harvard) report: "We observed the field of the short-duration GRB 150831A (Lien et al., GCN 18209) with the Karl G. Jansky Very Large Array (VLA) beginning on 2015 Aug 31.934 UT (11.9 hr post-burst) at a mean frequency of 9.8 GHz. In 1 hour of observations, we do not detect any radio source within or around the enhanced XRT position (Osborne et al., GCN 18212) to a 3-sigma limit of 25 microJy. Furthermore, we obtained a second set of observations beginning on 2015 Sep 2.954 UT (2.5 days post-burst) at a mean frequency of 9.8 GHz and do not detect any radio source in or around the XRT position to a 3-sigma limit of 21 microJy. We therefore place 3-sigma limits of 25 microJy and 21 microJy on the radio afterglow of GRB 150831A at 11.9 hr and 2.5 days after the burst, respectively. We thank the VLA staff for quickly executing these observations."