{
  "bibcode": "2007GCN..6406....1G",
  "body": "P. Garnavich (Notre Dame), X. Fan, (U Ariz), X. Dai, J. Prieto,\nK. Z. Stanek (Ohio State), J. Hill (LBTO/UAz), J. Bechtold (U Ariz),\nR. M. Wagner (LBTO/OSU), J. Rhoads (Ariz State) report:\n\nThe Large Binocular Telescope (LBT) imaged the position of the GRB 070419A\nafterglow (Stamatikos et al, GCN 6302; Chornock et al. GCN 6304) with the\nLBC-blue CCD camera (http//lbc.mporzio.astro.it) and 8.4-m SX mirror on\n2007 April 23.15 (UT). Ten dithered, 200 second exposures were obtained\nwith the Sloan-r filter in 1.2\" seeing. The combined image shows a faint\nsource at J2000 12:10:58.80  39:55:33.71 +/-0.2 arcsec which is coincident\nwith the Chornock et al. coordinates.\n\nAssuming the star at RA = 182.73852, DEC = 39.93033 J2000 has a Sloan r\nMODEL magnitude of 20.394 mag (Swan et al. GCN 6339; Cool et al. GCN\n6318), we find the source at the position of the afterglow to be\nr=24.75 +/- 0.18 mag at 3.7 days after the burst.\n\nObservations less than an hour after the burst by Smith et al. (GCN 6315)\nand Swan et al. (GCN 6339) compared with our photometry imply a power-law\ndecay index of 0.9+/-0.1 over nearly 4 days. This is consistent with the\ninitial decline index of 1.1 (Swan et al. GCN 6339) and suggests that\neither no break in the light curve had occurred or the host galaxy is\ncontributing to the measured LBT flux.\n\nThe LBT image can be found at:\nhttp://www.nd.edu/~pgarnavi/grb070419a/grb070419a_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": 6406,
  "createdOn": 1178835445000,
  "email": "pgarnavi@nd.edu",
  "subject": "GRB 070419A, Deep LBT photometry",
  "submitter": "Peter Garnavich at U of Notre Dame  <pgarnavi@nd.edu>",
  "eventId": "GRB 070419A"
}