{
  "bibcode": "2015GCN.18153....1C",
  "body": "S. B. Cenko (NASA/GSFC) and D. A. Perley (DARK) report on behalf of a larger collaboration:\n\nWe observed the location of GRB150817A (D�Elia et al., GCN 18143) with the robotic Palomar 60 inch telescope (P60).  Observations began at 3:35 UT on 2015 Aug 17 (~ 90 min after the Swift trigger time).  We detect a faint source at the location of the (second) candidate optical afterglow from RATIR (Butler et al., GCN 18145).  Using nearby point sources from the APASS survey, we measure an i-band magnitude of 21.42 +/- 0.11 in a stacked frame at a median epoch of dt = 125 min after the Swift trigger.",
  "circularId": 18153,
  "createdOn": 1439904621000,
  "email": "brad.cenko@nasa.gov",
  "subject": "GRB 150817A: P60 Observations",
  "submitter": "S. Bradley Cenko at NASA/GSFC  <brad.cenko@nasa.gov>",
  "eventId": "GRB 150817A"
}