{
  "bibcode": "2006GCN..5335....1J",
  "body": "Pall Jakobsson (U. Hertfordshire), Johan P.U. Fynbo,\nJens Hjorth (DARK, NBI), Tine B. Nielsen and Karianne\nHolhjem (NOT, La Palma) report:\n\nWe observed the afterglow position of GRB 060717 (Sakamoto\net al., GCN 5326) on July 17.906 (12.5 hr post-burst) in\nR-band and on July 17.922 (12.9 hr post-burst) in i-band with\nALFOSC on the Nordic Optical Telescope. Inside the revised\nXRT error circle (Capalbi et al., GCN 5331), we find no\nevidence for any sources. The limiting magnitudes of our\nobservations are R > 23.8 and i > 22.7.\n\nThe corresponding upper limit on beta_OX is 0.42, rendering\nthe burst dark according to the definition proposed by\nJakobsson et al. (2004, ApJ, 617, L21).",
  "circularId": 5335,
  "createdOn": 1153229942000,
  "email": "palli@star.herts.ac.uk",
  "subject": "GRB 060717: NOT observations",
  "submitter": "Pall Jakobsson at U Hertfordshire  <palli@star.herts.ac.uk>",
  "eventId": "GRB 060717"
}