{
  "bibcode": "2005GCN..2934....1C",
  "body": "P. B. Cameron (Caltech) and S. R. Kulkarni (Caltech) report:\n\n\"We observed a second epoch of the position of SGR 1806-20 with the Very\nLarge Array (VLA) in A-configuration on 2005 Jan 4.59 UT (t ~ 7.7 days\nafter the giant flare, GCN #2920). We again detect a radio source\ncoincident with the X-ray position reported by Kaplan et al. (2002, ApJ,\n564, 935) at the approximate freqeuncies and flux densities listed below.\n\nFreq (GHz)    Flux density (mJy)\n--------------------------------\n1.43          128 +/- 5\n4.86          62 +/- 2\n8.46          37 +/- 5\n\nError Bars are 1 sigma. The combination of these measurements with those\nreported 2005 Jan 03 (GCN #2928, #2929, 2930, ATEL 373) suggest a decay\nexponent (F ~ t^beta) of beta = -2.2 at 1.4 GHz. The spectral index\n(F ~ nu^alpha) has remained constant over the two epochs with alpha =\n-0.74 and -0.68.\n\nThe National Radio Astronomy Observatory is operated by Associated\nUniversities, Inc., under cooperative agreement with the National Science\nFoundation.\"",
  "circularId": 2934,
  "createdOn": 1104859940000,
  "email": "pbc@astro.caltech.edu",
  "subject": "Second Epoch VLA observations of SGR 1806-20",
  "submitter": "Patrick B. Cameron at Caltech  <pbc@astro.caltech.edu>"
}