[vsnet-grb-info 18795] GRB 161129A: GTC redshift of the likely host galaxy
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Dec 10 00:32:11 JST 2016
TITLE: GCN CIRCULAR
NUMBER: 20245
SUBJECT: GRB 161129A: GTC redshift of the likely host galaxy
DATE: 16/12/09 15:31:37 GMT
FROM: Zach Cano at U of Iceland <zewcano at gmail.com>
Z. Cano (IAA-CSIC), D. Malesani (DARK/NBI and DTU Space), A. de Ugarte
Postigo (IAA-CSIC, DARK/NBI), L. Izzo, C. C. Thoene (IAA-CSIC) and N.
Castro-Rodriguez (GRANTECAN/IAC/Universidad de La Laguna) report:
We observed the field of GRB 161129A (Kocevski et al., GCN Circ. 20210)
with OSIRIS on the 10.4 m GTC telescope on La Palma (Spain). The
observations started at 19:46:40.9 UT on 05-December-2016 (6.52 days after
the burst), which consisted of 4 x 1200 s spectra using grism R1000B, which
covers the wavelength range 3700-7800 angstroms, with a resolution of
R~1000.
Within the enhanced XRT error region (Beardmore et al. 2016, GCN Circ.
20211) we note the presence of sources A & B detected by Heintz et al. (GCN
Circ. 20244). The spectrum of the extended object (source B) shows a
continuum with a strong emission line that we attribute to the [OII]
3727/3729 doublet at z=0.645, as well as weaker emission lines consistent
with being H-gamma and H-delta at the same redshift. We propose this
star-forming galaxy to be the host of GRB 161129A. The spectrum of source A
displays absorption features of Ca II K and H, Mg I and MgH at z~0,
confirming it is a foreground star and not related to GRB 161129A.
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