{
  "bibcode": "2000GCN...654....1S",
  "body": "B. Stecklum, S. Klose (Thueringer Landessternwarte Tautenburg), \nO. Fischer (Universitaets-Sternwarte Jena),\nJ. Gorosabel (DSRI, Copenhagen),  \nC. Sanchez-Fernandez (LAEFF-INTA, Madrid),\nA. Castro-Tirado (LAEFF-INTA, Madrid, and IAA-CSIC, Granada), \nD. Butler (Max-Planck-Institut fuer Extraterrestrische Physik, Garching),\nS. Hippler, Th. Ott, M. Kasper, R. Weiss\n   (Max-Planck-Institut fuer Astronomie, Heidelberg),\nL. Montoya, A. Aguirre (Max-Planck-Institut fuer Astronomie, Heidelberg, \n   and Calar Alto observatory),\nA. Henden (USRA/USNO), on behalf of the USNO GRB team,\nD. H. Hartmann (Clemson University, Clemson), and\nJ. Greiner (AIP Potsdam)\n\n\nreport:\n\nAs a supplement to our previous GCN report (Klose et al., GCN #645) we\ncan provide now a more accurate estimate of the K'-band magnitude of\nthe afterglow of GRB 000418. It is based on the assumption that the\nB-R colours of three USNO stars on the detection image are\nrepresentative for their spectral types. A value of K' = 17.5 was\nfound with an uncertainty of 0.5 mag.\n\nIn addition, in GCN #645 one should read: The limiting magnitude of the \n(3.5-m) K'-band images is about 18.5.\n\nThis message is quotable.",
  "circularId": 654,
  "createdOn": 956945486000,
  "email": "klose@tls-tautenburg.de",
  "subject": "GRB000418, K'-band photometry",
  "submitter": "Sylvio Klose at TLS Tautenburg  <klose@tls-tautenburg.de>",
  "eventId": "GRB 000418"
}