{
  "bibcode": "2009GCN.10093....1C",
  "body": "S. B. Cenko (UC Berkeley), M. M. Kasliwal and S. R. Kulkarni (Caltech)\nreport on behalf of a larger collaboration:\n\nWe have obtained optical spectra of the afterglow of GRB091024 (Marshall\net al., GCN 10062) with the Low Resolution Imaging Spectrometer mounted on\nthe 10-m Keck I telescope.  Observations began at 11:01 UT on 24 October\n2009 (~ 2.1 hours after the burst) and covered the wavelength range from ~\n3500 - 10000 A.\n\nIn addition to the features identified by Cucchiara, Fox, and Tanvir (CaII\nH & K, Mg I), we also find strong absorption features we identify as Mg\nII (2796 / 2803) and Fe II (2344, 2374, 2382, 2586, and 2600) at a common\nredshift of z = 1.091.  The lack of Lyman-alpha absorption places an upper\nlimit of z <~ 1.9 on the redshift of GRB091024.",
  "circularId": 10093,
  "createdOn": 1256670730000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 091024: Keck/LRIS Spectroscopy",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 091024"
}