{
  "bibcode": "2007GCN..6462....1G",
  "body": "P. Garnavich (Notre Dame), N. Bouche, P. Buschkamp (MPE),\nO. Kuhn (LBTO/UAz), X. Fan, (U Ariz), X. Dai, J. Prieto,\nK. Z. Stanek (Ohio State), J. Hill (LBTO/UAz), J. Bechtold,\nJ. Kern (U Ariz), R. M. Wagner (LBTO/OSU), J. Rhoads (Ariz State)\nreport:\n\nThe Large Binocular Telescope (LBT) imaged the position of the GRB 070518\nafterglow (Guidorzi et al, GCN 6415; Xin et al. GCN 6416) with the\nLBC-blue CCD camera (http//lbc.mporzio.astro.it) and 8.4-m SX mirror on\nthree epochs beginning 2007 May 19.32 (UT) (17.2 hours after the burst).\nA fading source is clearly detected at the position of the afterglow\nat all three epochs. Assuming the USNO-B.1 star at 16:56:47.39\n+55:17:45.8 (J2000) has an R2=19.12 mag, we estimate the total brightness\nof the source (shown in the table below) using a 1.3\" radius aperture.\n\n UT Date   Age (hr)   Exposures    Seeing    R2 mag  Error\n-----------------------------------------------------------\nMay 19.32   17.2       5x200s      0.75\"    23.03   0.05\nMay 20.31   41.0       5x200s      1.0\"     23.36   0.05\nMay 22.21   86.4      15x200s      1.1\"     23.56   0.05\n\nThe slow fading implies significant contribution from a host\ngalaxy, and in good seeing the source appears elongated to the\nsouthwest.\n\nCombining observations from Price et al. (GCN 6443), Covino et al.\n(GCN 6426) and Jelinek et al. (GCN 6418, corrected to USNO-B.1 catalog)\nwith the LBT estimates shows that a single power-law decline with index\n0.95+/-0.05 added to a host galaxy of R=23.8+/-0.1 mag fits all the\nobservations spanning 10 minutes to 100 hours after the burst.\n\nThe May 19 LBT image can be found at:\nhttp://www.nd.edu/~pgarnavi/grb070518/grb070518_LBT.jpg\n\nThe LBT is an international collaboration among institutions in the\nUnited States, Italy and Germany. The LBT Corporation partners are:\n*  The University of Arizona on behalf of the Arizona university system\n*  Istituto Nazionale di Astrofisica, Italy\n*  LBT Beteiligungsgesellschaft, Germany, representing the Max Planck\nSociety, the Astrophysical Institute Potsdam, and Heidelberg University\n*  The Ohio State University\n*  The Research Corporation, on behalf of The University of Notre Dame,\nUniversity of Minnesota and University of Virginia\n\n\nThis message may be cited",
  "circularId": 6462,
  "createdOn": 1180129551000,
  "email": "pgarnavi@nd.edu",
  "subject": "GRB 070518, deep LBT photometry",
  "submitter": "Peter Garnavich at U of Notre Dame  <pgarnavi@nd.edu>",
  "eventId": "GRB 070518"
}