{
  "bibcode": "2005GCN..3299....1C",
  "body": "S. Bradley Cenko and Derek B. Fox (Caltech) report on behalf of the\nCaltech-NRAO-GRB collaboration:\n\nWe have imaged the field of GRB050421 (GCN #3296) with the automated\nPalomar 60-inch telescope.  Observations consisted of 17 x 120 s images\nin the Kron R band, taken at a mean epoch of 08:50 UT (~ 4.6 hours after\nthe burst).  We find no sources in the XRT error circle reported in GCN\n#3296.  Our 3.0-sigma limiting magnitude, estimated by comparison with\nseveral stars from the Guide Star Catalog, is approximately R < 22.0.",
  "circularId": 3299,
  "createdOn": 1114077280000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB050421: P60 Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 050421"
}