{
  "bibcode": "2009GCN..9557....1C",
  "body": "S. B. Cenko (UC Berkeley), A. J. Levan (U. Warwick), M. M. Kasliwal, S. R.\nKulkarni (Caltech) report on behalf of a larger collaboration:\n\nWe have imaged the field of the short GRB090621B (Curran et al., GCN 9545)\nwith the automated Palomar 60-inch telescope.  Observations consisted of\n20 x 180 s images in the i' filter at a mean epoch of 5:37 UT on 22 June\n2009 (~ 7.5 hours after the burst).\n\nWe detect the candidate afterglow reported by Levan et al. (GCN 9547) and\nGaleev et al. (GCN 9549) at low significance.  Using several USNO-B\nsources in the field for reference, we measure a magnitude of I ~ 22.9.\nNo other sources are detected inside the revised XRT error circle\n(Beardmore et al., GCN 9550).\n\nDirectly comparing our P60 image with the WHT image from ~ 2 hours after\nthe burst (GCN 9547), we find the candidate has faded marginally by 0.5 +-\n0.3 mag.  Further late-time observations will be needed to confirm if this\nis the optical afterglow of GRB090621B.",
  "circularId": 9557,
  "createdOn": 1245692424000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 090621B: P60 Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 090621B"
}