{
  "bibcode": "2005GCN..2929....1G",
  "body": "RADIO DETECTION OF SGR 1806-20 FOLLOWING A GIANT FLARE\n\nB. M. Gaensler (CfA), C. Kouveliotou (NASA/MSFC, NSSTC), R. Wijers\n(University of Amsterdam), M. Garrett (JIVE), M. Finger, P. Woods, S.\nPatel (USRA, NSSTC), M. McLaughlin (Jodrell Bank) report on behalf of a\nlarger team:\n\nWe observed the soft gamma-ray repeater SGR 1806-20 with the Very Large\nArray, approximately 7 days after the detection of a Giant Flare from\nthe source (Borkowski, J. et al., 2004, GCN # 2920), on January 3, 2005\nfor one hour (19:46-20:46 UT). At frequencies of 1.4, 4.9 and 8.5 GHz,\nwe detect an unresolved radio source at coordinates (J2000) RA\n18h08m39.3s, Dec -20o24'39.7\", with an approximate uncertainty of 0.1\"\nin each coordinate. This is consistent with the X-ray position of SGR\n1806-20 as given by Kaplan et al., ApJ 564, 935 (2002).  Since this is\nthe first time the source has been observed in radio, we suggest that we\ndetected transient emission from a synchrotron wind bubble, as was seen\nby Frail et al., Nature, 398, 127 (1999) one to two weeks after a Giant\nFlare from SGR 1900+14. The preliminary flux density of the source is\n160 +/-10, 78 +/-3 and 45 +/-3, mJy at 1.4, 4.9 and 8.5 GHz,\nrespectively.  Further observations are planned with the VLA on January\n4, 14:15-15:15 UT. We are grateful to the VLA Scheduling Officers (Jim\nUlvestadt and Joan Wrobel) for approving our request for Target of\nOpportunity observations of the source.",
  "circularId": 2929,
  "createdOn": 1104785031000,
  "email": "chryssa.kouveliotou-1@nasa.gov",
  "subject": "SGR1806 VLA Observations",
  "submitter": "Chryssa Kouveliotou at MSFC  <chryssa.kouveliotou-1@nasa.gov>"
}