[vsnet-grb-info 4828] GRB 070621: Watcher Observations
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Fri Jun 22 10:28:13 JST 2007
TITLE: GCN CIRCULAR
NUMBER: 6562
SUBJECT: GRB 070621: Watcher Observations
DATE: 07/06/22 01:28:07 GMT
FROM: John French at UCD,Ireland <jfrench at 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.
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