{
  "bibcode": "2006GCN..5155....1C",
  "body": "S. B. Cenko (Caltech), E. Berger (Carnegie), S. G. Djorgovski, A. A.\nMahabal (Caltech), and D. B. Fox (Penn State) report on behalf of a\nlarger collaboration:\n\nWe have observed the location of the afterglow of GRB060522 (Fox et al.,\nGCN 5150; D'Avanzo et al., GCN 5151) with the Low-Resolution Imaging\nSpectrometer mounted on the 10-m Keck I telescope.  We obtained an 1800\ns spectrum shortly before morning twilight at a mean epoch of May 22.65\nUT (~ 12.5 hr after the burst).\n\nWe find a prominent absorption feature centered around ~ 7425 A, with a\nstrong depression in flux blue-ward of this break.  Identifying this as\nthe Lyman-alpha break and fitting a DLA profile to the spectrum, we find\nz = 5.11 +/- 0.01 and log(nH) = 20.5 +/- 0.5.\n\nAt this redshift and using a 15-150 keV fluence of 1.1e-6 (Krimm et al.,\nGCN 5153), we find the prompt emission isotropic energy release from\nGRB060522 is 5.1e52 ergs.",
  "circularId": 5155,
  "createdOn": 1148336266000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB060522: z = 5.11 Keck-LRIS Redshift",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 060522"
}