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The RR Lyrae Distance to the Draco Dwarf Spheroidal Galaxy
A. Z. Bonanos, K. Z. Stanek, A. H. Szentgyorgyi +2
We present the first CCD variability study of the Draco dwarf spheroidal galaxy. The data were obtained with the FLWO 1.2 m telescope on 22 nights, over a period of 10 months, cove…
High-Precision Photometry of the Gamma-Ray Burst 020813: The Smoothest Afterglow Yet
L. T. Laursen, K. Z. Stanek
We report results of our precise reduction of the high signal-to-noise VRI observations of the optical afterglow of the gamma-ray burst GRB 020813 obtained by Gladders & Hall with…
The Type Ic Hypernova SN 2003dh/GRB 030329
P. A. Mazzali, J. Deng, N. Tominaga +6
The spectra of SN 2003dh, identified in the afterglow of GRB030329, are modeled using radiation transport codes. It is shown that SN 2003dh had a high explosion kinetic energy ($\s…
Photometry and Spectroscopy of GRB 030329 and Its Associated Supernova 2003dh: The First Two Months
T. Matheson, P. M. Garnavich, K. Z. Stanek +4
We present extensive optical and infrared photometry of the afterglow of gamma-ray burst (GRB) 030329 and its associated supernova (SN) 2003dh over the first two months after detec…
Limits on eclipses of the pre-main-sequence star KH 15D in the first half of the 20th century
Joshua N. Winn, Peter M. Garnavich, K. Z. Stanek +1
Over the last decade, the pre-main sequence star KH 15D has exhibited periodic eclipses that are surprisingly deep (~3 mag) and long-lasting (~40% of the 48.4-day period). The caus…
Re-analysis of VLT Data for M83 with Image Subtraction -- Nine-fold Increase in Number of Cepheids
A. Z. Bonanos, K. Z. Stanek
We apply the image subtraction method to re-analyze the ESO Very Large Telescope data on M83 (NGC 5236), obtained and analyzed by Thim et al. Whereas Thim et al. found 12 Cepheids…
DIRECT Distances to Nearby Galaxies Using Detached Eclipsing Binaries and Cepheids. IX. Variables in the Field M31Y Discovered with Image Subtraction
A. Z. Bonanos, K. Z. Stanek, D. D. Sasselov +3
The DIRECT Project aims to obtain direct distances to two Local Group galaxies, M31 and M33, which occupy a crucial position near the bottom of the cosmological distance ladder. Th…
Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329
K. Z. Stanek, T. Matheson, P. M. Garnavich +19
We present early observations of the afterglow of the Gamma-Ray Burst (GRB) 030329 and the spectroscopic discovery of its associated supernova SN 2003dh. We obtained spectra of the…
Multiwavelength observations of the GRB000615 field
E. Maiorano, N. Masetti, E. Palazzi +6
We report on prompt and afterglow observations of GRB 000615 detected by BeppoSAX. The study of the high-energy prompt event is presented along with the search for its X-ray and op…
New X-ray quasars behind the Small Magellanic Cloud
A. Dobrzycki, K. Z. Stanek, L. M. Macri +1
We present five X-ray quasars behind the Small Magellanic Cloud, increasing the number of known quasars behind the SMC by ca. 40%. They were identified via follow-up spectroscopy o…