{
  "bibcode": "2005GCN..3732....1P",
  "body": "J. X. Prochaska (UCO/Lick),  H.-W. Chen (MIT), J. S. Bloom (UCB),\nJ. O'Meara (MIT), S. M. Burles (MIT), I. Thompson (OCIW)\nreport on behalf of the GRAASP collaboration:\n\n\"We have performed preliminary analysis of our MIKE spectrum of\nthe afterglow of GRB 050730.  A profile fit to the Lya and Lyb\nabsorption lines of the sightline through the host galaxy gives\nN(HI) = 22.15 +/- 0.05.  The simple and narrow metal-line profiles\ngive a redshift z=3.96855 +/- 0.00005. We estimate a neutral gas\nmetallicity of S/H ~ 1/100 solar which is lower than the\nmean metallicity of damped Lya system at this redshift.  More  \nstrikingly,\nwe identify fine-structure lines of SiII*, OI*, OI**, and FeII*, the\nmajority of which are saturated.  Also, we identify absorption\nfeatures near 6150A which we interpret as the NV absorption doublet.\n\nFinally, we identify an intervening damped Lya system at\nz=3.5650 +/- 0.0001 with log N(HI)= 20.30 +/- 0.15 and low metallicity\nas well as a z=1.773 MgII absorber.\n\nA full analysis is underway.\n\nFigures can be found at this following site:\n    http://www.graasp.org/Data/index.html",
  "circularId": 3732,
  "createdOn": 1122962434000,
  "email": "xavier@ucolick.org",
  "subject": "GRB 050730: Preliminary Analysis of MIKE Spectrum",
  "submitter": "Jason Prochaska at UCO/Lick Obs  <xavier@ucolick.org>",
  "eventId": "GRB 050730"
}