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GCN Circular 8346

GRB 081008: Gemini-South Absorption Redshiftt
2008-10-09T04:15:43Z (16 years ago)
Antonino Cucchiara at PSU <>
A. Cucchiara, D. B. Fox (Penn State), S. B. Cenko  (Berkeley) and E. Berger
(Harvard) report on behalf of a larger collaboration:

Starting at 00:20 UT on 2008 October 9 (T0+5h) we observed the optical
counterpart of GRB 081008 (Racusin et al., GCN 8344, Rykoff  et al.,
GCN 83433) using Gemini-South with the GMOS-South spectrograph (R~1600).
We acquired 2x900s spectra covering the wavelength range 3800A-6700A.

We clearly detect several metal absorption features which we interpret as
SiIV(1393,1402), SiII1526, SiII*1816, CIV(1548,1550), FeII1608, AlII1670,
NiII1703, AlIII(1854,1862), MgI2026 at the common redshift of z = 1.967.

The absorption system identified by D'Avanzo et al. (GCN 8345) can be
explained by the CIV and SiII/SiII* doublets at this redshift.

We thank the Gemini staff for conducting these observations.
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