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SDSS J1029+2623: A Gravitationally Lensed Quasar with an Image Separation of 22.5 Arcseconds
Naohisa Inada, Masamune Oguri, Tomoki Morokuma +16
We report the discovery of a cluster-scale lensed quasar, SDSS J1029+2623, selected from the Sloan Digital Sky Survey. The lens system exhibits two lensed images of a quasar at z_s…
Optical and X-Ray Observations of GRB 060526: A Complex Afterglow Consistent with An Achromatic Jet Break
X. Dai, J. P. Halpern, N. D. Morgan +5
We obtained 98 R-band and 18 B, r', i' images of the optical afterglow of GRB 060526 (z=3.21) with the MDM 1.3m, 2.4m, and the PROMPT telescopes in Cerro Tololo over the 5 nights f…
The X-ray Properties of Optically-Selected Galaxy Clusters
Xinyu Dai, Christopher S. Kochanek, Nicholas D. Morgan
We stacked the X-ray data from the ROSAT All Sky Survey for over 4,000 clusters selected from the 2MASS catalog and divided into five richness classes. We detected excess X-ray emi…
Time-Delay Measurement for the Quadruple Lens RX J1131-1231
Nicholas D. Morgan, Christopher S. Kochanek, Emilio E. Falco +1
We have measured the three time delays for the quadruple gravitational lens RX J1131-1231 using two seasons of monitoring data. The short delays between cusp images are A-B = 11.98…
"Anomalous" Optical GRB Afterglows are Common: Two z~4 Bursts, GRB 060206 and 060210
K. Z. Stanek, X. Dai, J. L. Prieto +9
We report on two recent z~4 gamma-ray bursts (GRBs), GRB 060206 and GRB 060210, for which we have obtained well-sampled optical light curves. Our data, combined with early optical…