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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1897 SUBJECT: GRB 030226 spectroscopy DATE: 03/02/27 13:08:12 GMT FROM: Ryan Chornock at UC Berkeley <chornock@astro.berkeley.edu> R. Chornock and A. V. Filippenko (UC Berkeley) report: We obtained a pair of spectra (2 x 1000 s) of the optical afterglow (GCN 1879) of GRB 030226 (GCN 1888) using the Low Resolution Imaging Spectrometer (resolution ~ 6 angstroms, spectral range 3150-10000 angstroms) on Keck I. We see the three previously noted absorption systems, at redshifts 1.044, 1.962, and 1.986 (GCNs 1882, 1884, 1886, and 1889). The higher redshift absorbers have many lines of common interstellar species. In addition, we note a broad absorption system with multiple components from 3600 and 3640 angstroms. We identify these as the Lyman-alpha absorptions of the two high-redshift systems. Blueward of this complex, the continuum has many absorption lines, which we identify as the onset of the Lyman-alpha forest. Therefore, we conclude that the highest redshift absorption system is at the redshift of the GRB.
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