TITLE: GCN CIRCULAR NUMBER: 16449 SUBJECT: GRB 140621A: Swift-XRT observations DATE: 14/06/24 13:35:43 GMT FROM: Valerio D'Elia at ASDC V. D'Elia (ASDC), L. Izzo (URoma/ICRA) & J. R. Cummings (NASA/UMBC) report on behalf of the Swift-XRT team: The XRT began observing the field of GRB 140621A on 2014-06-23 at 21:01:54 UT, 177 ks after the IPN trigger (Golenetskii et al. GCN Circ 16444, 16445; Younes & Meegan, GCN Circ 16447). An observation centered on RA, Dec: 25.0642, 22.4111 has been secured. In the 4 ks exposure covering 60% of the IPN box that remained after the BAT non-detection exclusion, we do not find any new X-ray source, down to a three sigma upper limit of 3.05E-03 cts/s. This circular is an official product of the Swift/XRT team.