{
  "bibcode": "2012GCN.13723....1S",
  "body": "R. Sanchez-Ramirez, J. Gorosabel (IAA-CSIC), A. de Ugarte Postigo \n(IAA-CSIC, DARK/NBI) and J.M. Gonzalez Perez (GTC) report \non behalf of a larger collaboration:\n\nWe have obtained spectroscopy of the afterglow of GRB 120907A \n(Racusin et al. GCN 13716) with OSIRIS/ GTC (La Palma, Spain) on \nSep 7.20647-7.23893 UT (4.55-5.33 hours post GRB). The observation \nconsisted of 3x900s exposures using the R1000R grating, covering the \nrange from 5100 to 10000 A with a resolution of ~1100.\n\nIn the combined spectrum we detect several absorption features \ncorresponding to FeII, MgII, MgI and CaII at a common redshift of z=0.970, \nwhich we identify as the redshift of the GRB.\n\nWe acknowledge the excellent support of the GTC staff.",
  "circularId": 13723,
  "createdOn": 1347035720000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 120907A: Spectroscopy from OSIRIS/GTC",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 120907A"
}