{
  "bibcode": "2012GCN.14059....1P",
  "body": "D. A. Perley (Caltech), J. X. Prochaska (UCO/Lick), and A. N. Morgan (UC \nBerkeley) report:\n\nWe slewed with the Keck I telescope (+LRIS) to the location of GRB \n121211A (Mangano et al., GCN 14057) immediately following the GCN \nnotice.   The optical transient (Mangano et al.; Japelj et al., GCN \n14058) was identified on the guider camera and longslit exposures began \nat 14:01 UT, 14 minutes after the GRB trigger.  After a single short \nobservation in low resolution we acquired 2x860s exposures on the blue \nand red side.  The spectral range extends from 3150-5630 and 5790-7440 \nAngstroms.\n\nWe identify FeII (2344, 2374, 2382, 2586, 2600) and possible FeII* and \nMnII at a redshift of z=1.023, as well as a marginal detection of MgII \n(2796, 2804) at the same redshift using the short initial exposure, \nwhich covers the dichroic gap.   We suggest this as the redshift of GRB \n121211A.",
  "circularId": 14059,
  "createdOn": 1355251085000,
  "email": "dperley@astro.caltech.edu",
  "subject": "GRB 121211A: Keck/LRIS redshift",
  "submitter": "Daniel Perley at Caltech  <dperley@astro.caltech.edu>",
  "eventId": "GRB 121211A"
}