{
  "bibcode": "2007GCN..6556....1C",
  "body": "S. B. Cenko (Caltech), D. B. Fox, A. Cucchiara (Penn State), B. P. Schmidt\n(Australia National University), E. Berger (Carnegie), P. A. Price (IfA),\nand K. C. Roth (Gemini) report on behalf of a larger collaboration:\n\nStarting on 2007 June 17 at 06:10 UT we used GMOS on the Gemini North\ntelescope to obtain a 600 s spectrum of the afterglow + host galaxy of GRB\n070612A (Grupe et al., GCN 6509).  The spectrum was taken in twilight at\nvery high airmass (~ 3.2) and covers the wavelength range ~ 4000-8120 A.\n\nWe find a strong, broad (~ 10 A) emission line at ~ 6229 A that, based on\nthe lack any blueward emission features, we identify as [O II] 3727 at\nz=0.617.  We also notice another possible emission feature at the very red\nedge of our spectrum corresponding to H-beta at the same redshift.  No\nother features are detected either in emission nor in absorption.\n\nWe note that this redshift is significantly larger than the original SDSS\nphotometric redshift (z ~ 0.1) noted by Cenko, Ofek, and Fox (GCN\n6525), and is more consistent with the larger redshift (z ~ 0.4) noted by\nMalesani et al. (GCN 6555).  The larger distance would naturally explain\nthe faintness of any associated SN emission, as noted by these authors.\n\nWe wish to thank and acknowledge the effort of the staff at Gemini North\nin undertaking these difficult observations.",
  "circularId": 6556,
  "createdOn": 1182227860000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB070612A: Gemini Spectroscopic Redshift",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 070612A"
}