{
  "bibcode": "1999GCN...397....1K",
  "body": "J. Kemp, R. Uglesich, N. Mirabal, J. Halpern (Columbia),\nD. Harkavy (Harvard), E. Costa (IAS/CNR, Rome) report \non behalf of the BeppoSAX team and the MDM Observatory \nGRB follow-up team's southern extension:\n\n\"We reobserved the BeppoSAX WFC error circle of GRB 990806\n(Piro GCN 392; Gandolfi GCN 393) in the R band using the CTIO 0.9m.\nA total exposure of 180 minutes was obtained starting on\nAug. 8.31 UT.  Seeing was 1\".3.  The 5-sigma limiting magnitude\nof the summed R-band image is 23.8.  No variable object is\ndetected in comparison with images obtained on the previous night\n(GCN 395).  Using a sensitive difference imaging technique,\nwe set a limit of R > 23.3 on Aug. 7.3 for any fading optical \ntransient in the WFC error circle.  This is consistent with the \nR-band limit of 23.5 set by the ESO 2.2m (Greiner et al. GCN 396).\n\nThe new image is posted at http://www.astro.bio2.edu/grb/\n\nThis message may be cited.\"",
  "circularId": 397,
  "createdOn": 934156782000,
  "email": "jonathan@astro.bio2.edu",
  "subject": "GRB 990806, Optical Observations",
  "submitter": "Jonathan Kemp at Biosphere 2 Ctr/Columbia U  <jonathan@astro.bio2.edu>",
  "eventId": "GRB 990806"
}