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GCN Circular 6083

GRB070208: Absorption and emission redshift from Gemini
2007-02-08T20:55:39Z (17 years ago)
Antonino Cucchiara at PSU <>
A. Cucchiara (PSU), D. B. Fox (PSU), S. B. Cenko (Caltech) and
P. A. Price (Hawaii) report on behalf of a larger collaboration:

"We observed the optical afterglow (Guidorzi et al., GCN 6077, Fox et
al., GCN 6078) of GRB 070208 (Sato et al., GCN 6074) with the
Gemini-North telescope + Gemini Multi-Object Spectrograph in four
1800-s integrations with mean epoch 11:37 UT on 8 Feb 2007
(approximately 2.5 hours after the burst).  Our spectral coverage is
4000-8300 A.  The bright nearby galaxy seen in archival images (e.g.,
Mirabal & Halpern, GCN 6075) does not fall within our slit.

At the afterglow position we observe a strong [OII] (3727 A) emission
line at redshift z=1.165 superposed on the afterglow continuum, along
with multiple metal absorption features consistent with this redshift,
including: the MgII (2796.4 A, 2803.5 A) doublet, FeII (2600.5 A), and
MnII (2576.9 A).

We conclude that the redshift of GRB 070208 and its underlying host
galaxy is z=1.165."
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