{
  "bibcode": "2011GCN.11736....1C",
  "body": "S. B. Cenko (UC Berkeley), J. X. Prochaska (UC Santa Cruz / Lick\nObservatory), A. Cucchiara, D. A. Perley, and J. S. Bloom (UC Berkeley)\nreport on behalf of a larger collaboration:\n\nWe have obtained a spectrum of the candidate optical afterglow of GRB\n110213B (Negoro et al., GCN 11716) with the Gemini Multi-Object\nSpectrograph mounted on the 8-m Gemini South telescope.  Observations\nbegan at 00:44 UT on Feb. 16 and cover the wavelength range from 3900 -\n6700 A.\n\nSuperposed on a smooth continuum, we detect a series of strong, narrow\nabsorption lines corresponding to Mg I, Mg II, Fe II, and Fe II* at a\ncommon redshift of z = 1.083.  The detection of fine structure lines\nfirmly establishes this as the redshift of the GRB host galaxy.\n\nAn additional, strong Mg II absorption system is also present at z =\n0.717.  This may be related to the potential host candidate identified in\npre-outburst SDSS Stripe 82 imaging (Cenko et al., GCN 11735).\n\nAt z = 1.083, the prompt fluence measured by Konus (Golenetskii et al.,\nGCN 11722) correponds to a prompt isotropic energy release of 5.5e52 erg\n(20 - 1400 keV observer-frame bandpass).\n\nWe wish to thank the staff at Gemini Observatory, in particular Fredrik\nRantakyro, for the prompt execution of these observations.",
  "circularId": 11736,
  "createdOn": 1297829422000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 110213B: Gemini South Redshift",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 110213B"
}