{
  "bibcode": "2009GCN..9243....1C",
  "body": "R. Chornock, D. A. Perley, S. B. Cenko, and J. S. Bloom (UC Berkeley) report on\nbehalf of a larger collaboration:\n\nWe obtained optical spectra of the afterglow of GRB 090424 (Cannizzo et al., GCN\n9223) using GMOS on Gemini-South.  Our spectra cover the wavelength range of\n4400-8600 angstroms.  Our first 1200s exposure, starting at 01:51:56 April 25 UT\n(11.7 hr after the trigger) reveals.a pair of absorption lines at 6077 and 6130\nAngs, which we identify as the Ca II H+K doublet at z=0.544.  Additionally, an\nemission line is present at 5758 A, which is consistent with the [O II] 3727\ndoublet at the same redshift, which we therefore identify as the redshift of the\nhost galaxy.  We note that this redshift is significantly higher than the\nphoto-z noted by Evans & Holland (GCN 9226).",
  "circularId": 9243,
  "createdOn": 1240628544000,
  "email": "chornock@astro.berkeley.edu",
  "subject": "GRB 090424 Gemini-South Redshift",
  "submitter": "Ryan Chornock at UC Berkeley  <chornock@astro.berkeley.edu>",
  "eventId": "GRB 090424"
}