{
  "bibcode": "2013GCN.15307....1C",
  "body": "R. Chornock, R. Lunnan, and E. Berger (Harvard) report:\n\nWe observed the optical afterglow (Xu et al., GCN 15304; Malesani et al., GCN \n15305; Kopac et al., GCN 15306) of the possible short GRB 131004A (Hagen et al., \nGCN 15303) using LDSS-3 on the 6.5-m Magellan Clay Telescope.  A sequence of \n3x1200s spectroscopic exposures of the afterglow began at 23:44 on 4 October UT. \n  A preliminary reduction reveals a flat continuum with superposed weak emission \nlines from [O II], H-beta, and [O III] at a common redshift of 0.717.  Possible \nweak features consistent with Ca II H+K absorption at this same redshift are \nalso present.",
  "circularId": 15307,
  "createdOn": 1380934591000,
  "email": "rchornock@cfa.harvard.edu",
  "subject": "GRB131004A: Magellan Redshift",
  "submitter": "Ryan Chornock at Harvard  <rchornock@cfa.harvard.edu>",
  "eventId": "GRB 131004A"
}