{
  "bibcode": "2007GCN..6528....1M",
  "body": "Gary Melady, John French, (University College Dublin), Petr Kubanek, \nMartin Jelinek (IAA CSIC Granada, Spain)\n\non behalf of the Watcher collaboration report:\n\nThe Watcher 40cm robotic telescope, located at Boyden Observatory, South\nAfrica, began imaging the field of GRB 070611 (Stroh et al., GCN\n6494) at 01:58:33 UT, 1m 17s after the Swift trigger (40s after receipt of \nthe GCN notice).\n\nWe combined our initial series of 10s exposures to create a 440s unfiltered \nimage with an exposure mid-time of 2:05:21 (501s after the burst). This shows \nno new source in the XRT error box (Stroh et al., GCN 6496) down to an R-band \nlimiting magnitude of approx. 19.2 (in comparison to USNO-B1). Later images show \na faint, uncatalogued source within the XRT error box coincident with the ROTSE \ndetection (Rykoff et al., GCN 6497).\n\nThese observations are summarised below:\n\nmean time UT      t-t0(s) \texp(s) \t      Rmag\n-------------------------------------------------------- \n 02:18:56          1316\t\t 900\t  19.08 +/- 0.24\n 02:32:48\t   2148\t\t 210\t  18.53 +/- 0.24\n 02:37:11\t   2411\t\t 180\t  19.12 +/- 0.30\n 02:42:46\t   2746\t\t 240\t  18.99 +/- 0.26\n 02:48:54\t   3144\t\t 330\t  19.19 +/- 0.24\n\nThe source is not detected in subsequent observations down to an R-band limiting \nmagnitude of approx 19.2.\n\nThe field was no longer observed after 02:54 due to the system's\nincorrect handling of the retracted XRT position.\n\nThis message may be cited.",
  "circularId": 6528,
  "createdOn": 1181757470000,
  "email": "gmelady@bermuda.ucd.ie",
  "subject": "GRB 070611: Watcher Observations",
  "submitter": "Gary Melady at UCD  <gmelady@bermuda.ucd.ie>",
  "eventId": "GRB 070611"
}