{
  "bibcode": "2010GCN.11307....1D",
  "body": "A. de Ugarte Postigo (DARK/NBI), H. Flores (Paris Obs.), K. Wiersema (U.\nLeicester), C.C. Thoene (NBIA), J.P.U. Fynbo (DARK/NBI), P. Goldoni\n(APC/Univ. Paris 7 and SAp/CEA) report on behalf of the X-shooter GRB\ncollaboration:\n\nWe have observed the optical source related to GRB 100925A/MAXI J1659-152\n(Mangano et al. GCN Circ. 11296, Marshall et al. GCN Circ. 11298) using\nthe X-shooter spectrograph mounted at the Kueyen telescope of ESO's VLT\n(Paranal Observatory, Chile). The spectrum consists of a combined exposure\nof 2x600s and was started at 23:40 UT on September 25. The spectrum covers\nthe complete range from 3000 to 24800 angstroms. In a preliminary analysis\nwe identify broad emission lines from the Balmer series of hydrogen and\nHeII as well as CaII and Na I absorption from the ISM of the MW, all at\nredshift zero. The emission lines have a width of about 2000 km/s showing\na double peak profile. The spectrum is consistent with that of an X-ray\nbinary and we hence confirm that GRB 100925A/MAXI J1659-152 is a Galactic\nsource (Kann GCN Circ. 11299, Negoro et al.  ATEL 2873).\n\nWe thank the Paranal staff for excellent support, in particular Claudio Melo.",
  "circularId": 11307,
  "createdOn": 1285493109000,
  "email": "deugarte@iaa.es",
  "subject": "GRB100925A/MAXI J1659-152: X-shooter identification as an X-ray  binary",
  "submitter": "Antonio Deugarte at IAA-CSIC  <deugarte@iaa.es>",
  "eventId": "GRB 100925A"
}