{
  "bibcode": "2013GCN.14291....1M",
  "body": "D. Malesani, D. Xu, J. P. U. Fynbo, T. Kruehler (DARK/NBI), D. A. Perley \n(Caltech), S. D. Vergani (CNRS/GEPI), P. Goldoni (APC/IRFU-CEA), report \non behalf of the GRB GTO X-shooter collaboration:\n\nWe observed the field of GRB 100424A (Hoversten et al., GCN 10667) using \nthe Keck-I telescope equipped with the LRIS instrument. Observations \nwere carried out on 2010 July 8.2 UT (74.5 days after the burst), \nsimultaneously in the g and I bands, for a total exposure time of 35 and \n32 min, respectively.\n\nConsistent with the position of the NIR afterglow (Cenko et al., GCNs \n10682, 10690, 10692), we detected a source with g = 26 (AB) and I = 24.4 \n(Vega). We consider this object to be the host galaxy of GRB 100424A.\n\nA spectrum of this source was taken on 2013 March 11.3 UT with the ESO \nVLT equipped with the X-shooter spectrograph, covering the wavelength \nrange 3000-25000 AA. The exposure time was 8x600 s. In the NIR arm, we \ndetect four emission lines, that we interpret as [O III](4959), [O \nIII](5007), Hbeta, and [O II](3727), all at a common redshift of z = \n2.465. In the UVB arm, we also detect weak Lyalpha in emission at the \nsame redshift.\n\nWe acknowledge excellent support from the observing staff at Mauna Kea \nand Paranal, in particular Thomas Rivinius and Claudio Melo.",
  "circularId": 14291,
  "createdOn": 1363104474000,
  "email": "malesani@dark-cosmology.dk",
  "subject": "GRB 100424A: Keck host detection and VLT/X-shooter redshift",
  "submitter": "Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst  <malesani@dark-cosmology.dk>",
  "eventId": "GRB 100424A"
}