{
  "bibcode": "2017GCN.21359....1D",
  "body": "A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), D.A. Kann, \nL. Izzo, C.C. Thoene (HETH/IAA-CSIC), G. Lombardi S. Geier \n(GTC, IAC-ULL), A. Garcia, A. Perez (GTC) report:\n\nFollowing the detection of the afterglow (de Ugarte Postigo et al. GCN \n21346) of the ultra-long GRB 170714A (D'Ai et al. GCN 21340, Kann \net al. GCN 21345) we obtained further NIR and optical observations on \n19 and 20 of July, with detections in r, i, z, and H-bands. An object is \nstill observed at the position earlier reported, indicating an important \nhost galaxy contribution.\n\nOn 21 July, at 4:53 UT (5.69 days after the burst) we obtained \nspectroscopy of the afterglow/host galaxy with OSIRIS at the 10.4m \nGTC telescope (La Palma, Spain). Observations consisted of 4x900 s\nwith grism R1000R, covering the range between 5100 and 10000 AA.\n\nThe combined spectrum shows a weak trace with several \nsuperimposed emission lines, which we interpret as due to [OII], [OIII] \nand H-beta, through which we derive a redshift for the host galaxy, \nand hence for GRB 170714A, of 0.793.",
  "circularId": 21359,
  "createdOn": 1500618986000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 170714A: Bastille Day Burst redshift from OSIRIS/GTC",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 170714A"
}