{
  "bibcode": "2011GCN.12401....1C",
  "body": "S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:\n\nWe have imaged the field of GRB 110928A (Hoversten et al., GCN 12394) with\nthe automated Palomar 60 inch telescope.  Observations were obtained in\nthe Sloan r', i', and z' filters beginning at 4:11 UT on 2011 September 28\n(~ 2.3 hours after the Swift trigger).\n\nWe do not detect any sources within the XRT error circle (Evans et al.,\nGCN 12398).  Using nearby point sources from the Sloan Digital Sky Survey\nfor reference, we calculate the following upper limits (AB):\n\nr' > 22.1\ni' > 21.6\nz' > 20.3\n\nWe note the presence on the northern edge of the XRT error circle of one\n(possibly two) extended sources present in SDSS.  The large size of the\ncurrent X-ray localization precludes any firm association with GRB\n110928A, however.",
  "circularId": 12401,
  "createdOn": 1317189577000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 110928A: P60 Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 110928A"
}