{
  "bibcode": "2007GCN..6284....1M",
  "body": "H. Mikuz, J. Skvarc and B. Dintinjana on behalf of PIKA observing program at\nCrni Vrh Observatory:\n\nWe observed a 42'x42' field centered on Swift position at ra=12:06:01\ndec=+40:06:03 (J2000), using 60 cm Cichocki robotic telescope at Crni Vrh\nObservatory,  Slovenia.  There is no obvious source down to R magnitude\n20.7 +/-0.1 inside the error box 3x3 arc minutes on 90 s R filter\nexposure, starting at 2007 Apr. 12 01:39:03 UT (46 seconds after reception\nof the alert) and 5 subsequent images of the same duration. Magnitudes\nwere calibrated against the USNO-B1 catalogue. In particular we also do\nnot observe any source to this limiting magnitude at the coordinates\nreported by NOT (Malesani and Uthars, GCN 6276) or Jelinek et al. (GCN\n6279).",
  "circularId": 6284,
  "createdOn": 1176370832000,
  "email": "herman.mikuz@fmf.uni-lj.si",
  "subject": "GRB 070412: Optical observations at Crni Vrh",
  "submitter": "Herman Mikuz at OCV  <herman.mikuz@fmf.uni-lj.si>",
  "eventId": "GRB 070412"
}