[vsnet-grb-info 19489] GRB 170531B: WHT spectroscopy
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Wed Jun 7 18:19:12 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 21209
SUBJECT: GRB 170531B: WHT spectroscopy
DATE: 17/06/07 09:17:35 GMT
FROM: Klaas Wiersema at U Leicester <kw113 at leicester.ac.uk>
K. Wiersema, N. Tanvir (Leicester), A. Levan (Warwick) report:
We observed the afterglow of GRB 170531B (Evans et al. GCN 21171; Lipunov et al. GCN 21173;
Pozanenko et al. GCN 21174) with the 4.2m William Herschel Telescope on La Palma, using the
ACAM instrument. We obtained a spectrum, consisting of 4x900 seconds exposure time, starting
at 02:55 UT on 1 June 2017. Our wavelength coverage is ~4500 - 9500 A. We detect a small
number metal lines (at low S/N) at a redshift consistent with that obtained by de Ugarte-Postigo
et al. (GCN 21177).
We warmly thank the staff of ING, in particular Raine Karjalainen, for their assistance.
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