{
  "bibcode": "2017GCN.21240....1D",
  "body": "A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), L. Izzo (IAA-CSIC), \nC.C. Thoene (IAA-CSIC), Z. Cano (IAA-CSIC), D. A. Kann (IAA-CSIC), \nR. Scarpa (GTC), and V. Herrera (GTC) report on behalf of a larger \ncollaboration:\n\nWe observed the afterglow of GRB 170607A (D���Ai et al. GCN 21214, \nHeintz et al. GCN 21217, Lipunov et al. GCN 21219, Volnova et al. \nGCN 21237) using OSIRIS at the 10.4m GTC telescope. Observation \nconsisted of 3x900s using grism R1000R, which covers the range \nbetween 5100 and 10100 ��, at a mean epoch of 10.1955 June 2017 \nUT (2.2222 days after the GRB).\n\nThe acquisition image still shows a bright afterglow at r(AB) = 20.70 \n+/- 0.05 mag, as compared to SDSS field stars. In spite of the strong \ncontribution from the afterglow, no clear absorption features can be \ndetected in this spectral range. However, there are strong emission \nlines due to [OII], [OIII], and H-beta at a common redshift of 0.557, \nwhich we identify as the redshift of the GRB.",
  "circularId": 21240,
  "createdOn": 1497080026000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 170607A: Redshift from GTC/OSIRIS",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 170607A"
}