A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J. Gorosabel (IAA-CSIC, UPV/EHU),
C.C. Thoene (IAA-CSIC), J.P.U. Fynbo (DARK/NBI), D. Xu (DARK/NBI),
D. Perez-Valladares (GTC), and G. Gomez-Velarde (ULL-IAC, GTC) report on
behalf of a larger collaboration:
We have observed the afterglow of the Fermi GRB140801A (Gorbovskoy et al.
GCN 16653, Xu et al. GCN 16655) with the 10.4m GTC (+OSIRIS). Spectroscopic
observations began at 3:35 UT (8.59 hr after the burst). The first 900 s spectrum
was obtained with the R1000B grism, and covered the range between 3630 and
7500 A, at a resolution of ~1000.
We detect a strong continuum with absorption features that correspond to NiII,
MnII, FeII, MgII, and MgI at a common redshift of z=1.320, which we identify as the
redshift of the GRB.
Further spectroscopic observations are ongoing.