{
  "bibcode": "2011GCN.12771....1C",
  "body": "S. B. Cenko (UC Berkeley) reports on behalf of a larger collaboration:\n\nWe have imaged the field of GRB111228A (Ukwatta et al., GCN 12737) with\nthe automated Palomar 60 inch telescope.  Observations were obtained in\nthe r' and i' filters beginning at 10:27 UT on 2011 December 29 (~ 18.9\nhours after the Swift trigger).\n\nWe detect the optical afterglow with a magnitude of r' = 20.3 +/- 0.1 mag\n(AB, calibrated with respect to several point sources from the Sloan\nDigital Sky Survey in the field).  Compared with previous reported\nmeasurements of the afterglow brightness, this suggests a steeper decay\nthan observed at early times (e.g., Klotz et al., GCN 12742).\n\nFurther observations are planned.",
  "circularId": 12771,
  "createdOn": 1325188839000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 111228A: P60 Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 111228A"
}