{
  "bibcode": "1999GCN...342....1P",
  "body": "H. Pedersen, B. L. Jensen, J. Hjorth (Copenhagen), M. Holman (CfA, USA), \nK. Aksnes, T. Grav, N. Haug, A. O. Jaunsen (Oslo), M. I. Andersen, \nand H. Korhonen (NOT), report:              \n\nWe have observed the position of GRB 990506, using the ALFOSC\ninstrument on the 2.56-m Nordic Optical Telescope, La Palma, Spain. \n\nWe covered almost the entire IPN+RXTE error box (Hurley et al., GCN 298), \nusing two separate pointings, each of which is 6' x 6'.  \n\nAt each position, we obtained a 480 s R-band exposure, between \n1999 May 6.91 - 7.05 UT (seeing 0.9\" - 1.2\" FWHM) and a 240 s R-band \nexposure, on 1999 May 7.91 UT (seeing 0.7\" FWHM). \n\nWe have compared the exposures internally, finding no evidence for \nvariable objects to a limiting magnitude of R = 22.0, for variability\namplitude above 0.3 magnitude.",
  "circularId": 342,
  "createdOn": 927379499000,
  "email": "holger@astro.ku.dk",
  "subject": "GRB 990506 optical observation",
  "submitter": "Holger Pedersen at Copenhagen U Obs  <holger@astro.ku.dk>",
  "eventId": "GRB 990506"
}