Soft gamma-ray repeaters (SGRs) are 'magnetars', a small class of slowly spinning neutron stars with extreme surface magnetic fields, B approximately 10(15) gauss (refs 1 , 2 -3). On 27 December 2004, a giant flare was detected from the magnetar SGR 1806-20 (ref. 2), only the third such event recorded. This burst of energy was detected by a variety of… (More)
Jupiter's nonthermal microwave emission, as measured by a global network of 11 radio telescopes, increased dramatically during the Shoemaker-Levy 9 impacts. The increase was wavelength-dependent, varying from approximately 10 percent at 70 to 90 centimeters to approximately 45 percent at 6 and 36 centimeters. The radio spectrum hardened (flattened toward… (More)
We report on radio and X-ray observations of the black hole candidate (BHC) XTE J1550−564 performed during its 2000 X-ray outburst. Observations have been – 2 – conducted with the Australia Telescope Compact Array (ATCA) and have allowed us to sample the radio behavior of XTE J1550−564 in the X-ray Low Hard and Intermedi-ate/Very High states. We observed… (More)
The Molonglo Observatory Synthesis Telescope (MOST) has been monitoring the candidate Galactic black hole binary system GX 339−4 at 843 MHz since 1994 April. We present the results of this program up to 1997 February and show a possible correlation between radio and X-ray light curves.