TITLE: GCN CIRCULAR NUMBER: 7397 SUBJECT: GRB 080310: Redshift from Keck/DEIMOS Spectra DATE: 08/03/10 17:20:17 GMT FROM: Jason Prochaska at UCO/Lick Obs J.X. Prochaska (UCSC), R.J. Foley (UCB), B. Holden (UCCS), D. Magee (UCSC), M. Cooper (Arizona) and A. Dutton (UCSC) report on behalf of GRAASP: "We observed the afterglow of GRB 080310 (Chornock, #7381) with the Keck/DEIMOS spectrometer for a series of 900s exposures starting ~2hr after the burst under good conditions. Analysis of the data confirms the three absorption systems reported by Prochaska et al. (#7388) and Vreeswijk et al. (#7391). We identify modest strength FeII and MgII resonance lines associated with the absorber at z=2.4266 and also weaker FeII* absorption. The latter observation establishes this gas as the ISM surrounding GRB 080310. Further analysis is in progress." This GCN may be cited.