GCN Circular 6562
Subject
GRB 070621: Watcher Observations
Date
2007-06-22T01:28:07Z (17 years ago)
From
John French at UCD,Ireland <jfrench@bermuda.ucd.ie>
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.