{
  "bibcode": "2011GCN.12444....1C",
  "body": "S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:\n\nWe have imaged the field of GRB111016A (Mangano et al., GCN 12439) with\nthe robotic Palomar 60 inch telescope.  Observations began at 11:30 UT on\n2011 October 17 (~ 16.9 hours after the initial Swift trigger) and were\nobtained in the Sloan r', i', and z' filters.\n\nInside the revised localization of the X-ray afterglow (Evans et al., GCN\n12441) we marginally detect a source in the i' filter with coordinates:\n\n   RA: 10:15:20.23; Dec: +27:27:44.0 (J2000.0)\n\nCompared with nearby point sources from the Sloan Digital Sky Survey, we\nmeasure a magnitude of i' ~ 22.1 +/- 0.3 mag at this time.  No significant\nemission is detected at this location in the r' filter to r' > 21.9 mag.\n\nGiven the modest significance of the detection in only a single filter, we\nencourage further observations to confirm if this possible source is\nindeed the afterglow of GRB111016A.",
  "circularId": 12444,
  "createdOn": 1318859442000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 111016A: P60 Afterglow Candidate",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 111016A"
}