{
  "bibcode": "2016GCN.19497....1C",
  "body": "S. B. Cenko and E. Troja (NASA/GSFC) report on behalf of a larger collaboration:\n\nWe imaged the location of the optical afterglow (Malesani et al., GCN 19485) of the short GRB 160601A (Kocevski et al., GCN 19478) with the Large Monolithic Imager on the 4.3-m Discovery Channel Telescope in Happy Jack, AZ.  We obtained a series of 180 s exposures in the r-band filter beginning at 5:00 UT on 2016 June 3 (~ 1.6 d after the Swift trigger).  We do not detect any significant emission at the location of the optical afterglow to a limiting magnitude of r > 25.0 (calculated with respect to nearby point sources from SDSS).  Compared to the most recent detection with Gemini (Cenko et al, GCN 19492), our limits imply a significant steepening of the afterglow decay, with a lower limit on the power-law index of alpha > 1.3 (compared to alpha ~ 0.6 at earlier times; Schulze et al. 19488).\n\nWe thank the observers (T. Farnham, M. Knight, and L. Feagan) and the DCT staff for their assistance with these observations.",
  "circularId": 19497,
  "createdOn": 1464975155000,
  "email": "brad.cenko@nasa.gov",
  "subject": "GRB 160601A: Discovery Channel Telescope Limits",
  "submitter": "S. Bradley Cenko at NASA/GSFC  <brad.cenko@nasa.gov>",
  "eventId": "GRB 160601A"
}