{
  "bibcode": "2018GCN.22346....1D",
  "body": "A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), Z. Cano, L. Izzo, \nC.C. Thoene, D.A. Kann (HETH/IAA-CSIC), N. Castro-Rodriguez \n(Grantecan, IAC, ULL), D. Perez Valladares (Grantecan) report on \nbehalf of a larger collaboration:\n\nWe observed the afterglow of GRB 180115A (Cannizzo et al. GCN 22335, \nCano et al. GCN 22345) with OSIRIS at the 10.4m GTC telescope. The \nobservation consisted of 3x900s exposure with grism R1000B, covering \nthe range between 3700 and 7800 Angstrom and was performed under \nbad seeing conditions.\n\nThe observation started at 20:32 UT (16.28 hr after the burst), and the \nacquisition image shows the afterglow at r=21.2+/-0.2. The spectrum \nshows a weak continuum over all the spectral range. The low signal to \nnoise ratio of the spectrum only allows us to detect a single broad spectral \nfeature that we identify as Lyman alpha at a redshift of 2.487.",
  "circularId": 22346,
  "createdOn": 1516057060000,
  "email": "deugarte@iaa.es",
  "subject": "GRB 180115A: Redshift from OSIRIS/GTC",
  "submitter": "Antonio de Ugarte Postigo at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 180115A"
}