{
  "bibcode": "2005GCN..2938....1C",
  "body": "P. B. Cameron (Caltech) and S. R. Kulkarni (Caltech) report:\n\n\"We have carried out a more thorough calibration of the three VLA\nepochs of the fading radio source toward SGR 1806-20 (GCN#s 2928,\n2929, 2930, 2933, 2934, 2935). Combining this with the data from a\nfourth epoch observation made with the Australia Compact Array (GCN#\n2937) we do a joint fit of the form: F_nu \\propto t^\\alpha nu^\\beta.\n\nThe best fit values are alpha= -1.62+/-0.06 and beta=-0.75+/-0.03.\n\nThere is evidence of deviations from this simple power-law behavior.\nFitting the decay rate alpha at each frequency we find a systematic\nsteepening. The value of alpha is -1.0 at 1.4 GHz, -1.5 at 4.9 GHz,\nand -2.2 at 8.5 GHz. This behavior is reminiscent of the broadband\nafterglow of GRB 991216 (Frail et al. ApJ, 538, 129). A plot of the\nlight curves is at: http://www.aoc.nrao.edu/~dfrail/sgr1806lc.eps.\n\n\nThe National Radio Astronomy Observatory is operated by Associated\nUniversities, Inc., under cooperative agreement with the National\nScience Foundation. The Australia Telescope is funded by the\nCommonwealth of Australia for operation as a National Facility managed\nby CSIRO.\"",
  "circularId": 2938,
  "createdOn": 1105020090000,
  "email": "dfrail@nrao.edu",
  "subject": "SGR 1806-20: Temporal and Spectral behavior of radio transient",
  "submitter": "Dale A. Frail at NRAO  <dfrail@nrao.edu>"
}