{
  "bibcode": "2001GCN...989....1B",
  "body": "GRB 010222: Keck Spectroscopy\n\nJ. S. Bloom, S. G. Djorgovski (Caltech), J. P. Halpern (Columbia), S. R.\nKulkarni, T. J. Galama, P. A. Price, S. M. Castro (Caltech) report on\nbehalf of the larger Caltech-NRAO-CARA GRB Collaboration:\n\n\"We obtained two epochs of optical spectroscopy of the transient of GRB\n010222 (GCN #959; #961) using the dual-CCD Low-Resolution Imaging\nSpectrometer (LRIS; Oke et al. 1995) on the Keck I 10-m telescope on Mauna\nKea, Hawaii.  We confirm the redshifts of the two absorption systems\npreviously reported by Garnavich et al. (GCN #965) and Jha et al. (GCN\n#974).  We find an additional absorption system at z=0.928 as well other\nas yet unidentified absorption lines.\n\nThe first set of spectra were taken by R. -P. Kudritzki and F. Bresolin on\n22.66 Feb 2001 UT using the 300/5000 grism (blue side) and 400/8500\ngrating (red side) with a total integration time of 1800s on-source in\nboth CCDs.  The second set of spectra were taken by H. Spinrad, D. Stern,\nA. Dey, A. Bunker, and S. Dawson on 23.66 Feb 2001 UT with the identical\nsetup and integration time as the first epoch.  \n\nA preliminary comparison of absorption-line strengths reveals no\nsignificant variation of the equivalent widths between the two epochs.\"\n\nWe thank A. A. Henden for providing an image of the GRB field which\nfacilitated the first epoch of spectroscopy.\n\nThis message may be cited.",
  "circularId": 989,
  "createdOn": 983083969000,
  "email": "jsb@astro.caltech.edu",
  "subject": "GRB 010222: Keck Spectroscopy",
  "submitter": "Josh Bloom at CIT  <jsb@astro.caltech.edu>",
  "eventId": "GRB 010222"
}