{
  "bibcode": "2015GCN.18155....1M",
  "body": "F. E. Marshall (NASA/GSFC) and V. D'Elia (ASDC)\nreport on behalf of the Swift/UVOT team:\n\nUVOT took a finding chart exposure of 28 seconds with the White filter\nstarting 94 seconds after the BAT trigger on GRB 150818A. \nThere is a candidate afterglow in\nthe rapidly available 2.7'x2.7' sub-image at\n  RA(J2000)  =  15:21:25.48 = 230.35616\n  DEC(J2000) =  68:20:34.0  = 68.34278\nwith a 90%-confidence error radius of about 1.0 arc sec. This position is 10\narcseconds from the center of the XRT error circle (D'Elia et al. GCN Circ. 18152). \nThe estimated magnitude is 19.5 with a 1-sigma error of about 0.2. \nNo correction has been made for extinction.",
  "circularId": 18155,
  "createdOn": 1439909975000,
  "email": "femarsha@khamseen.gsfc.nasa.gov",
  "subject": "GRB 150818A: Swift/UVOT candidate afterglow",
  "submitter": "Frank Marshall at GSFC  <femarsha@khamseen.gsfc.nasa.gov>",
  "eventId": "GRB 150818A"
}