[AAVSO-HEN] GRB 091127: Gemini-N redshift

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  10202
SUBJECT: GRB 091127: Gemini-N redshift
DATE:    09/11/28 11:27:46 GMT
FROM:    Antonino Cucchiara at PSU  <cucchiara at astro.psu.edu>

A. Cucchiara, D. Fox (PSU), A. Levan (Warwick U.) and
N. Tanvir (U. Leicester) report:

On November 28.40 UT we observed the afterglow of the Swift
GRB 091127 (Troja et al. GCN 10191; Smith et al. GCN 10192)
with the GMOS-N spectrograph on Gemini North. 

The observation consists of 2 exposures of 900 seconds each
with the R400 grating, covering 4000-8000A wavelength range.

The spectra shows a bright featureless continuum and two emission
lines which we identified as [OIII]4959 and 5007 respectively
at the common redshift of z = 0.490.

Therefore we suggest this as redshift for GRB 091127.

We thank the Gemini-N support staff, in particular A. Stephens,
for performing these observations.