{
  "bibcode": "2015GCN.17583....1D",
  "body": "A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), J.P.U. Fynbo (DARK/NBI), \nC. Thoene (IAA-CSIC), N.R. Tanvir (U. Leicester),  R. Sanchez-Ramirez \n(UPV, IAA-CSIC), J. Gorosabel (UPV-EHU, IAA-CSIC), P. Pessev (ULL, IAC), \nC. Alvarez Iglesias (ULL, IAC), M.A. Rivero (GRANTECAN) report on behalf \nof a larger collaboration:\n\nWe obtained spectroscopy of the afterglow of GRB 150314A (Hagen et al., \nGCN 17573; Zheng & Filippenko, GCN 17574; Axelsson et al., GCN 17576; \nTrotter et al., GCN 17577; Xu et al. GCN 17582) using OSIRIS at the 10.4 m \nGTC telescope in La Palma (Spain). Observations consisted of 3 x 1200 s \nexposure using the R1000B grism, covering the range between 3700 and \n7875 A at a resolution of ~700 (1\" slit). The mean observing time was 21:37 UT \n(16.70 hr after the burst).\n\nThe spectrum shows a continuum with an average  SNR ~ 7 (per resolution \nelement) on which several weak absorption features can be identified. Our \nbest match corresponds to lines of FeII, MgII, MgI as well as AlII, AlIII and CIV \nat lower significance, all at a common redshift of 1.758, which we propose as \nthe redshift of the GRB.\n\nAt this redshift, the isotropic equivalent energy is Eiso = 6.74e53 erg \nconsidering the fluence reported by Fermi/GBM (Yu et. al GCN 17579) in the \n(10-1000) keV window.",
  "circularId": 17583,
  "createdOn": 1426376365000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 150314A: Redshift from OSIRIS/GTC",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 150314A"
}