{
  "bibcode": "2001GCN...999....1C",
  "body": "GRB 010222: High-Resolution Keck Spectroscopy\n\nS. Castro, S. G. Djorgovski, S. R. Kulkarni, J. S. Bloom, T. J. Galama,\nD. E. Reichart, P. A. Price (Caltech), H. Ebeling (IfA Hawaii), and D. A. \nFrail (NRAO), report on behalf of the Caltech-NRAO-CARA GRB collaboration:\n\nSpectra of the optical transient associated with GRB 010222 (GCN # 959, 961)\nhave been obtained on 23.61 February UT by H. Ebeling, using the Echelle \nSpectrograph and Imager (ESI) on the Keck-II 10-m telescope.  Preliminary \nanalysis shows the following:\n\nWe confirm the existence of 3 absorption systems reported earlier (GCN # 965,\n974, 989), with improved heliocentric redshifts as follows:\n\n(1) z_abs = 1.4768 +- 0.0002  (based on 22 metallic lines)\n    This system, presumably associated with the host galaxy, appears to \n    have some kinematic substructure, possibly with two distinct systems at\n    z_1 = 1.47667 +- 0.00005  and  z_2 = 1.47755 +- 0.00005, i.e., with a\n    restframe velocity separation of 106 km/s, typical for internal motions\n    in galaxies.  The equivalent widths of the lines are unusually strong\n    in comparison to metallic line absorbers seen in the spectra of quasars,\n    indicating a high column density of gas, probably consistent with a\n    star-forming region environment.\n\n(2) z_abs = 1.1561 +- 0.0001  (based on 9 metallic lines)\n\n(3) z_abs = 0.9274 +- 0.0001  (based on 5 metallic lines)\n\nSystems (2) and (3) are typical for the metallic line absorbers at \ncomparable redshifts.  Detection of two such foreground systems is not \nunusual.  Further analysis of the data is in progress.\n\nThis note can be cited.",
  "circularId": 999,
  "createdOn": 983470086000,
  "email": "george@oracle.caltech.edu",
  "subject": "GRB 010222: High-Resolution Keck Spectroscopy",
  "submitter": "George Djorgovski at Caltech/Palomar  <george@oracle.caltech.edu>",
  "eventId": "GRB 010222"
}