{
  "bibcode": "2005GCN..3981....1C",
  "body": "S. Bradley Cenko (Caltech) and Derek B. Fox (Penn State) report on behalf\nof a larger collaboration:\n\nWe have imaged the error circle of GRB 050915 (Grupe et al., GCN 3977)\nwith the automated Palomar 60-inch telescope.  Observations began\napproximately 4 minutes after the burst in the Kron R and Gunn i filters.\nInside the XRT error circle (Kennea et al., GCN 3979), we find no source\npresent.\n\nUsing the USNO-B object located at 05:26:48.6, -28:00:48.9 (J2000.0, R2 =\n17.90, I2 = 17.88) as a reference, we find the following 3-sigma upper\nlimits for any point-source in the XRT error circle:\n\n\nFilter\t\tInt Time (s)\tMean UT\t\tTb (min)\tMag\n---------------------------------------------------------------------------\nR\t\t540\t\t11:41\t\t18\t\t> 21.0\ni\t\t540\t\t11:43\t\t20\t\t> 20.5",
  "circularId": 3981,
  "createdOn": 1126792457000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB050915: P60 Optical Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 050915"
}