{
  "bibcode": "2006GCN..4969....1D",
  "body": "A. K. Dupree, E. Falco (Harvard-Smithsonian CfA), J. X. Prochaska \n(UCO/Lick Observatory), H.-W. Chen (U Chicago), and J. S. Bloom (UC \nBerkeley) report on behalf of the GRAASP collaboration:\n\n\"We observed the afterglow of GRB060418 reported by Falcone et al. (GCN 4966)\nusing the MIKE echelle spectrograph on the Magellan Clay telescope with a\n0.7-arcsec slit.  The observations started at UT 03:34:02 on April 18, 2006,\n~ 28 minutes after the inital Swift/BAT trigger.  The first exposure had a\ntotal integration of 1200 sec under a mean seeing condition of 0.4 arcsec.\nThe mean signal-to-noise of the single exposure was S/N > 20 over the entire\n3500 Ang to 9000 Ang spectral coverage.  We observed the strongest absorption\nfeaures at 6978 Ang and 6959 Ang, which we identify as the MgII absorption\ndoublet originated in the host of the GRB at z=1.49.  We therefore adopt\nthis as the redshift of the GRB host due to the absense of any other\nabsorption features beyond 7100 Ang.\n\nFurther analysis is underway.\n\nThis message may be cited.\"",
  "circularId": 4969,
  "createdOn": 1145336681000,
  "email": "hchen@oddjob.uchicago.edu",
  "subject": "GRB060418: Magellan/MIKE Spectroscopic Redshift",
  "submitter": "Hsiao-Wen Chen at U Chicago  <hchen@oddjob.uchicago.edu>",
  "eventId": "GRB 060418"
}