GCN Circular 18966
Subject
GRB 160131A: GTC spectroscopy of the afterglow
Date
2016-01-31T23:49:42Z (8 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), C.C. Thoene (IAA-CSIC),
R. Sanchez-Ramirez (IAA-CSIC), Gabriel Gomez Velarde (GRANTECAN) and
Victor Herrera (GRANTECAN) report on behalf of a larger collaboration:
We observed the afterglow of GRB 160131A (Page et al. GCN 18951) with
the 10.4 m GTC equipped with OSIRIS. Observations consisted of 3x600s
spectra with grism R1000B (covering from 3700 to 7800 AA) and 3x600s
with grism R1000R (covering from 5100 to 10000 AA). The first spectrum
started at 21:52 UT (13.53 hr after the GRB onset) under very bad seeing
conditions (> 3").
In spite of the poor seeing we detect a strong continuum across the complete
range with multiple absorption features of FeII, NiII, MnII, MgII, MgI, and CaII
at a common redshift of 0.972, consistent with the value measured by
Malesani et al. from TNG (GCN 18965).
[GCN OPS NOTE(04feb16): Per author's request, GGV and VH were added
to the author list.]