TITLE: GCN CIRCULAR NUMBER: 6562 SUBJECT: GRB 070621: Watcher Observations DATE: 07/06/22 01:28:07 GMT FROM: John French at UCD,Ireland John French (University College Dublin), Petr Kubanek (GACE Valencia), Gary Melady (University College Dublin), Martin Jelinek (IAA CSIC Granada) report on behalf of the Watcher collaboration: The Watcher 40cm robotic telescope, located at Boyden Observatory, South Africa, began imaging the field of GRB 070621 (Sbarufatti et al., GCN 6560) at 23:18:21 UT, 40s after the Swift trigger. Our first 10s unfiltered image shows no new source in the XRT error circle down to an R-band limiting magnitude of 16.1. Subsequent 10s exposures were combined to create a 360s exposure with a mean time of 23:21:47 (247s after the trigger). No new source is detected in the XRT error circle down to an R-band limiting magnitude of 17.9. Observations are ongoing.