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Investigation of the possible third image and mass models of the gravitational lens PMN J1632-0033
Joshua N. Winn, David Rusin, Christopher S. Kochanek
We present multi-frequency VLBA observations of PMN J1632-0033, one of the few gravitationally lensed quasars suspected of having a central ``odd'' image. The central component has…
The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-time-scale variability
D. Bersier, K. Z. Stanek, J. Winn +11
We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (10-20%) deviations from a power law decay on several time scales,…
Interferometric Phase Calibration Sources in the Declination Range 0deg to -30deg
Joshua N. Winn, Alok R. Patnaik, J. M. Wrobel
We present a catalog of 321 compact radio sources in the declination range 0deg > delta > -30deg. The positions of these sources have been measured with a two-dimensional rms accur…