{
  "submitter": "Javier Gorosabel at LAEFF-INTA, Madrid  <jgu@laeff.esa.es>",
  "version": 2,
  "body": "J. Gorosabel* (IAA-CSIC, Granada), J.P.U. Fynbo* (Univ. of Aarhus), \nJ. Hjorth, H. Pedersen, B.L. Jensen (Univ. of Copenhagen),  \nS.T. Holland* (Notre Dame),  J.M. Castro Cerón* (ROA, San Fernando), \nM. Andersen (AIP, Potsdam), A.J. Castro-Tirado (IAA-CSIC, Granada) \nreport:\n\nWe have imaged the GRB 020813 (GCN 1471) optical afterglow (GCN 1470)\nwith the 1.54-m Danish Telescope (+DFOSC) as follows:\n\n ===================================================================\n  Date              Filter Seeing   Exp.Time  Time Since   Mag\n  (UT)                      (\")       (s)     GRB (days)\n -------------------------------------------------------------------\n 10.01-10.13/10/2002  R     1.0   2x1200+8x900  58.0    23.90+/-0.14\n 09.02-09.17/10/2002  B     1.7     10x1200     57.0    24.46+/-0.19 \n -------------------------------------------------------------------\n\nThe calibration is based on the photometric standards given in GCN \n1503. The B-R colour of our measurements (B-R=0.56+/-0.24) is bluer\nthan the ones reported for the afterglow to date (constant around\nB-R ~ 1, see GCN 1513).\n\nThis \"blueing\" could be due to a change of spectral slope in the \nafterglow or the presence of an underlying blue host galaxy.\n\nGiven the epoch of our observations (~60 days after the gamma-ray \nevent) we consider the second possibility more likely. The \nfaintness of our detection does not allow us to see any extended\nstructure.\n\nTwo gifs of the potential host galaxy can be seen at:\n\n http://www.dsri.dk/~jgu/grb020813/GCN/grb020813R.gif\n http://www.dsri.dk/~jgu/grb020813/GCN/grb020813B.gif\n\n-----------------------------------------------------\n * Visitors at the Copenhagen University Observatory.",
  "format": "text/plain",
  "editedOn": 1731923499008,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Leo P. Singer at NASA/GSFC <leo.p.singer@nasa.gov>",
  "eventId": "GRB 020813",
  "email": "jgu@laeff.esa.es",
  "bibcode": "2002GCN..1651....1G",
  "createdOn": 1035369559000,
  "subject": "GRB 020813; likely host galaxy.",
  "circularId": 1651
}