{
  "bibcode": "2013GCN.14511....1N",
  "body": "Jay Norris, Daryl Macomb (Boise State U.) report:\n\nWe observed GRB 130427A with the Challis Observatory's 0.4-m telescope\n(114.33 deg W, 44.5 deg N, 2165 m elevation) on April 29, 05:58 to 06:22 UT.\nUsing seventeen 10-second frames in the R filter acquired in a clear sky,\ncentered at ~ 06:06 UT, 22.3 hours after the Swift/BAT trigger (GCN 14448),\nwe clearly detected the optical afterglow.\n\nComparison with six stars in the field of view (R = 15.5 to 16.8 mag)\nyielded an estimate of R = 17.6 mag for the afterglow with uncertainty\nof ~ 0.15 mag.  Further observations were interrupted by clouds.\n\n[GCN OPS NOTE(30apr13): Per author's request, the affiliation in the FROM-line\nwas changed to Boise State U.]",
  "circularId": 14511,
  "createdOn": 1367294345000,
  "email": "jnorris@custertel.net",
  "subject": "GRB 130427A: Challis Observatory optical observations",
  "submitter": "Jay Norris at Boise State U.  <jnorris@custertel.net>",
  "eventId": "GRB 130427A"
}