[vsnet-grb-info 6189] GRB 080604: Gemini-North spectroscopy
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Thu Jun 5 05:47:01 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 7818
SUBJECT: GRB 080604: Gemini-North spectroscopy
DATE: 08/06/04 20:46:50 GMT
FROM: Klaas Wiersema at U of Leicester <kw113 at star.le.ac.uk>
K. Wiersema (U. of Leicester), J. Graham (STScI), N. Tanvir, E. Rol (U. of
Leicester), A. Levan (U. of Warwick) and A. Fruchter (STScI) report on
behalf of a larger collaboration:
We observed the optical afterglow of GRB 080604 (GCNC 7800, 7801) with
Gemini-North, using the GMOS-N instrument. Spectroscopy was performed with
the R400 grism, using 4 x 450 seconds integration time, starting at
2008 June 04, 08:58 UT.
Several absorption lines of, among others, Fe II (2382,2586,2600), Mg II
(2796,2803) and Mg I (2026,2852) are found at a redshift of 1.416. The
discrepancy with respect to the redshift reported in GCN 7805 may be due
to provisional calibration files used for the HET reduction (Cucchiara
priv. comm.).
We thank the Gemini staff astronomers for their support in obtaining these
observations.
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