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GCN Circular 7805

Subject
GRB 080604: Hobby-Eberly Telescope spectroscopy
Date
2008-06-04T11:39:53Z (16 years ago)
From
Antonino Cucchiara at PSU <cucchiara@astro.psu.edu>
A. Cucchiara and D. B. Fox (Penn State) report:

"Starting on 2008 June 4.35 UT we used the Marcario LRS spectrograph
on the Hobby-Eberly Telescope (R ~ 230) to obtain a 1200s spectrum
of the optical afterglow of GRB 080604 (La Parola et al., GCN 7800).
The spectrum covers the wavelength range 4500 to 10,000 Angstrom.
Based on a preliminary calibration we detect absorption features
corresponding to the MgII doublet (2796, 2803 A) and MgI (2852 A)
as well as other metal absorption features at redshift z = 1.28.

The absence of Lyman break in our dataset suggests z < 2.7.

A refined analysis will be posted.

We thank the HET staff for performing this observation,
in particular Matthew Shetrone."
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