{
  "bibcode": "2007GCN..6346....1P",
  "body": "J. Prieto (Ohio State), P. Garnavich (Notre Dame), J. Hill (LBTO/UAz),\nX. Fan, J. Harris (U Ariz), X. Dai,  P. Martini, K. Z. Stanek (Ohio State),\nR. M. Wagner (LBTO/OSU), J. Rhoads (Ariz State),\nS. Herbert-Fort (UAz) report:\n\nThe Large Binocular Telescope (LBT) imaged the position of the GRB 070411\nafterglow (Moretti et al, GCN 6267; Kann et al. GCN 6268) with the\nLBC-blue CCD camera (http//lbc.mporzio.astro.it) and 8.4-m SX mirror on\n2007 April 15.145 (UT). Ten dithered, 200 second exposures were obtained\nwith the Sloan-r filter in 0.7\" seeing. A point source within 0.1\" of\nthe Swift/UVOT position is clearly detected in each image.\n\nIn the combined image we find the afterglow to be 5.431 magnitudes\nfainter than the unsaturated star at RA=7:09:23.35 DEC=1:04:09.98\nand listed in the USNO-B catalog at R2=18.52 mag. An out-of-focus\nimage shows that this star is 0.916 mag fainter than the star\nused by Berger, Modjaz & Garg et al. (GCN 6278) implying the two\ncalibrations are consistent. So we find the afterglow brightness to\nbe r=23.95+/-0.05 mag. 3.30 days after the burst.\n\nImage subtraction of individual frames shows no significant\nvariability (<0.10 mag) on time-scale between 4 minutes and\nan 40 minutes.\n\nThe fading between the Berger et al. observation and the LBT\nimage is consistent with a power-law decay index of 1.0, but\nnote the possibility of a break reported by Malesani et al.\n(GCN 6343).\n\nThe LBT image can be found at:\nhttp://www.nd.edu/~pgarnavi/grb070411/grb070411_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": 6346,
  "createdOn": 1177353420000,
  "email": "pgarnavi@nd.edu",
  "subject": "GRB 070411, deep LBT photometry",
  "submitter": "Peter Garnavich at U of Notre Dame  <pgarnavi@nd.edu>",
  "eventId": "GRB 070411"
}