{
  "bibcode": "2005GCN..3746....1D",
  "body": "V. D'Elia, A. Melandri, F. Fiore, L. Stella, L. Sbordone (INAF-OAR), G.\nTagliaferri, S. Covino, D. Fugazza, D. Malesani (INAF/OABr), G.\nChincarini (Univ. Milano-Bicocca), M. Della Valle (INAF/Arcetri), L.\nPellizza (CEA, Saclay), R. Scarpa (ESO-Chile) on behalf of the MISTICI\ncollaboration, report:\n\nStarting on July 31, 2005 00:01:02 UT (about 4 hours after the GRB\ntrigger) we have obtained low- and high-resolution spectra (FORS1, Grism\n300V, R~800; UVES, R~40,000, 7.5 km/s in the observer frame) of the\noptical afterglow of GRB050730 (Holland et al., GCN 3704). The\nobservations consisted of 2 exposures for a total of 1800 second with\nFORS1 and 2 exposures for a total of 6000 seconds with UVES covering the\nfull spectral range 3500-9800 Angstrom. \n\nAt the time of the observations the afterglow magnitude was R~17.7 and\nthe decay of the afterglow, as measured from the FORS1 flux-calibrated\nspectra, is consistent with a temporal decay index of about -1. For the\nUVES spectra, the resulting continuum signal to noise per resolution\nelement spans from 10 to 20 in the 6000-9000 Angstrom range.\n\nA preliminary analysis of the data confirms a very rich spectrum and all\nfeatures reported by the GRAASP collaboration (GCN 3709 and 3732). We\nalso detect strong, saturated, SiIV1393,1402, CIV1548,1550, CII1334,\nCII*1335, Al1670, AlII1854 absorption lines at z=3.968. The main\nabsorption systems span a velocity range of up to 100 km/s.\n\nA full analysis is underway.\n\nWe thank the ESO staff for the excellent support in performing these\nobservations in  service mode.\n\nThis message can be quoted.",
  "circularId": 3746,
  "createdOn": 1123086829000,
  "email": "covino@merate.mi.astro.it",
  "subject": "GRB050730: FORS1 and UVES/VLT low- and high-resolution spectroscopy",
  "submitter": "Stefano Covino at Brera Astronomical Observatory  <covino@merate.mi.astro.it>",
  "eventId": "GRB 050730"
}