{
  "bibcode": "2009GCN..9264....1L",
  "body": "E. Levesque (IfA, U. Hawaii), R. Chornock (UC Berkeley), L. Kewley (IfA, U.\nHawaii), J. S. Bloom (UC Berkeley), J. X. Prochaska (UCO/Lick), D. A. Perley, S.\nB. Cenko, and M. Modjaz (UC Berkeley) report:\n\nWe obtained optical spectra of the afterglow of GRB 090426 (Cummings et al., GCN\n9254) using LRIS on the Keck-I telescope, covering the wavelength range of\n3000-9940 Angstroms.  Our first exposures started at 13:55 UT, 1.1 hrs after the\nBAT trigger.  Preliminary analysis of the spectra reveals a set of absorption\nlines at 4387, 5030, 5061, and 5592 Angstroms, which we identify as Lyman-alpha,\nSi IV 1394, Si IV 1403, and the C IV 1548/1551 doublet at a common redshift of\n2.609.  At this redshift, the observed T90 (Sato et al., GCN 9263) is 0.33 sec\nin the rest frame of the burst.  This burst may be on the short end of the long\nGRB population, similar to recent examples such as GRB 090423 (Krimm et al. GCN\n9198, Palmer et al. GCN 9204, Thoene et al. GCN 9216, Tanvir et al. GCN 9219,\nKrimm et al. GCN 9241), but we encourage further high-energy analyses of this event.",
  "circularId": 9264,
  "createdOn": 1240781778000,
  "email": "chornock@astro.berkeley.edu",
  "subject": "GRB 090426 Keck LRIS redshift",
  "submitter": "Ryan Chornock at UC Berkeley  <chornock@astro.berkeley.edu>",
  "eventId": "GRB 090426"
}