[vsnet-grb-info 13993] GRB131004A: Magellan Redshift
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Oct 5 09:57:54 JST 2013
TITLE: GCN CIRCULAR
NUMBER: 15307
SUBJECT: GRB131004A: Magellan Redshift
DATE: 13/10/05 00:56:31 GMT
FROM: Ryan Chornock at Harvard <rchornock at cfa.harvard.edu>
R. Chornock, R. Lunnan, and E. Berger (Harvard) report:
We observed the optical afterglow (Xu et al., GCN 15304; Malesani et al., GCN
15305; Kopac et al., GCN 15306) of the possible short GRB 131004A (Hagen et al.,
GCN 15303) using LDSS-3 on the 6.5-m Magellan Clay Telescope. A sequence of
3x1200s spectroscopic exposures of the afterglow began at 23:44 on 4 October UT.
A preliminary reduction reveals a flat continuum with superposed weak emission
lines from [O II], H-beta, and [O III] at a common redshift of 0.717. Possible
weak features consistent with Ca II H+K absorption at this same redshift are
also present.
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