TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  974
SUBJECT: GRB010222: Another absorption line system
DATE:    01/02/23 05:14:40 GMT
FROM:    Saurabh Jha at Harvard-Smithsonian CfA  <sjha@cfa.harvard.edu>

S. Jha, T. Matheson, M. Calkins, M. A. Pahre, K. Z. Stanek,
J. McDowell, R. Kilgard (Harvard-Smithsonian CfA), and 
P. M. Garnavich (Notre Dame) report:

Further reduction and analysis of the FLWO 1.5m spectrum of the GRB
010222 optical afterglow (GCN 965) reveals the presence of two
absorption systems along the line of sight to the gamma-ray burst, one
at z = 1.477 as reported, and another with weaker lines at z = 1.157.

The interstellar absorption lines observed from each system are as 
follows, with identifications based on the ultraviolet spectral atlas 
of Blades et al. (1988, ApJ, 334, 308):

 Observed         Line          Rest     Redshift
Wavelength   Identification  Wavelength
   (A)                          (A)

  7065.4         Mg I          2852.1	  1.477
  6941.7         Mg II         2802.7     1.477
  6924.0         Mg II         2795.5     1.477
  6438.5         Fe II         2599.4     1.477
  6422.4         Mn II         2593.7     1.476
  6405.4         Fe II         2585.9     1.477
  6381.2         Mn II         2576.1     1.477
  5900.1         Fe II         2382.0     1.477
  5879.6         Fe II         2373.7     1.477
  5805.4         Fe II         2343.5     1.477
  5108.5  Zn II/Cr II blend    2061.9     1.478
  5018.5  Zn II/Mg I blend     2025.6     1.478
  4478.9         Si II         1808.0     1.477
  4137.8         Al II         1670.8     1.477
  3838.0      C IV blend       1549.0     1.478
  3781.8         Si II         1526.7     1.477

  6045.0         Mg II         2802.7     1.157
  6028.2         Mg II         2795.5     1.156
  5606.7         Fe II         2599.4     1.157
  5574.1         Fe II         2585.9     1.156
  5137.2         Fe II         2382.0     1.157

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