2 papers
astro-ph2005
Fine-Structure FeII and SiII Absorption in the Spectrum of GRB 051111: Implications for the Burst Environment
E. Berger, B. E. Penprase, D. B. Fox +4
We present an analysis of fine-structure transitions of FeII and SiII detected in a high-resolution optical spectrum of the afterglow of GRB 051111 (z=1.54948). The fine-structure…
astro-ph2002
GRB 021004: a Massive Progenitor Star Surrounded by Shells
Bradley E. Schaefer, C. L. Gerardy, P. Hoflich +13
We present spectra of the optical transient of GRB021004 obtained with the Hobby-Eberly telescope starting 15.48, 20.31 hours, and 4.84 days after the burst and a spectrum obtained…