{
  "bibcode": "2009GCN..9028....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 performed spectroscopy on the afterglow of GRB 090323 (Ohno et al., GCN 9021;\nUpdike et al., GCN 9026; Cenko and Perley, GCN 9027) using Gemini-South (GMOS)\nstarting at 05:58 UT on 2009-03-24, approximately 30 hours after the trigger.\nWe conducted a series of four exposures of 600 seconds, two using the B600\ngrating centered at 6000 Angstroms and two with the R400 grating centered at\n8000 Angstroms.\n\nThe first spectrum shows strong absorption blueward of 5580 Angs, which we\nidentify as the onset of the Lyman-alpha forest at z=3.6.  There are also narrow\nabsorptions with multiple components from C IV, O I, C II, and Si IV at a\nconsistent redshift of z=3.57.  Further analysis is ongoing.\n\nWe would like to thank the Gemini-S staff, in particular Etienne Artigau, Lucas\nFuhrman, and Benoit Neichel, for their support with these observations.",
  "circularId": 9028,
  "createdOn": 1237879128000,
  "email": "chornock@astro.berkeley.edu",
  "subject": "GRB 090323 Gemini-South Redshift",
  "submitter": "Ryan Chornock at UC Berkeley  <chornock@astro.berkeley.edu>",
  "eventId": "GRB 090323"
}