{
  "bibcode": "2015GCN.17914....1T",
  "body": "V. Toy (UMD), J. Capone (UMD), S.B. Cenko (NASA-GSFC), S. Veilleux (UMD),\nA. Cucchiara (NASA-GSFC), E. Troja (NASA-GSFC),  and A. Kutyrev (NASA-GSFC)\nreport on behalf of a larger collaboration:\n\nWe observed the field of GRB150607A (Swift trigger 642620, D'Elia et al.,\nGCN 17904) with the Large Monolithic Imager (LMI) on the 4.3m Discovery\nChannel Telescope (DCT) at Happy Jack, AZ from 2015/06/08 03:42 to\n2015/06/08 04:35 UTC (starting 19.8 hours after the trigger). A source is\nclearly detected at the location of the optical afterglow in r', i', and\nz'.  Using nearby point sources from USNO-B1.0 for calibration, we measure\nr' = 22.03 +/- 0.03.\n\nThis magnitude is reported in AB magnitude and is not corrected for\nGalactic extinction in the direction of the GRB.\n\nCompared to NOT observations on 06/07 (Kruehler & Djupvik, GCN 17908) the\nafterglow has a decay index of ~ t^-1.1.\n\nWe thank the staff of the Discovery Channel Telescope for assistance with\nthese observations.",
  "circularId": 17914,
  "createdOn": 1433783666000,
  "email": "vtoy@astro.umd.edu",
  "subject": "GRB150607A: Discovery Channel Telescope Optical Observations",
  "submitter": "Vicki Toy at UMD  <vtoy@astro.umd.edu>",
  "eventId": "GRB 150607A"
}