GCN Circular 19278
Yi Cao, S. R. Kulkarni, Lin Yan, Vikram Ravi, H. K. Vedantham, Mansi M. Kasliwal (Caltech) We obtained a spectrum of the optical afterglow of GRB 160410A with the Low Resolution Imaging Spectrometer (LRIS) on the Keck-I telescope at Mauna Kea, following the Swift UVOT localization (GCN 19271). Our spectroscopic integration started 84.25 minutes after the Swift trigger at airmass 1.05 and one 600s spectrum was obtained covering 3100-10200 Angstrom. Our spectrum reveals a blue continuum superposed by a strong and broad absorption around centered around 3300 Angstrom as well as a number of weak and narrow absorption features. Upon obtaining the data we determined a redshift of 1.72 based primarily on the broad damped Lyman alpha and threshold detection of narrow Si II, O I, C IV and Mg II absorption lines. Our redshift is consistent to that derived from the VLT/X-shooter spectra (GCN 19274).