{
  "bibcode": "2015GCN.18274....1D",
  "body": "Antonio de Ugarte Postigo (IAA-CSIC, DARK/NBI), Christina Thoene (IAA-CSIC), \nGianluca Lombardi (IAC, ULL, GRANTECAN), and Alberto Perez (GRANTECAN) \nreport on behalf of a larger collaboration:\n\nWe have observed the afterglow of GRB 150910A (Pagani et al., GCN 18264) \nusing the 10.4 m GTC telescope equipped with OSIRIS. Our observation began \nat 23:11 UT (14.1 hr after the burst) and consisted of 3x900s exposures using the \nR1000B grism. The spectrum covers the wavelength range between 3700 and \n7800 AA.\n\nThe acquisition image shows the afterglow at a magnitude of r=20.65+/-0.07 as \ncompared to SDSS stars.\n\nThe first spectrum shows a continuum throughout the full spectral range, with \nseveral absorption features that correspond to AlII, AlIII, FeII, MgII and MgI at a \ncommon redshift of 1.360, which we interpret as the redshift of the GRB.",
  "circularId": 18274,
  "createdOn": 1441930630000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 150910A: Redshift from 10.4m GTC+OSIRIS",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 150910A"
}