{
  "bibcode": "2013GCN.14762....1C",
  "body": "S. B. Cenko (GSFC), N.R. Tanvir (Leicester)D. A Perley (Caltech), A. J. Levan (U. Warwick), and\nA. Cucchiara (UCSC / Lick) report on behalf of a larger collaboration:\n\nWe have obtained optical spectra of the afterglow (Perley et al., GCN\n14753) of GRB 130604A (Melandri et al., GCN 14752) with the Gemini\nMulti-Object Spectrograph mounted on the 8 m Gemini North telescope.\nObservations began at 8:16 UT on 2013 June 4 (~ 1.3 hr after the Swift\ntrigger) and cover the wavelength range from 4000 - 8000 A.\n\nSuperimposed on a faint continuum, we detect a single bright emission line\nat an observed wavelength of ~ 7674.0 A.  There is some evidence the\nemission line is spectrally resolved.  No other obvious features (in\nemission or absorption) are detected over our wavelength range.  If we\nassume this feature corresponds to [O II], this implies a redshift of z =\n1.06 for GRB 130604A.\n\n[GCN OPS NOTE(04Jun13): Per author's request, NRT was added to the author list.]",
  "circularId": 14762,
  "createdOn": 1370362037000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 130604A: Gemini North Spectroscopy",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 130604A"
}