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The Massive Progenitor of the Type II-Linear SN 2009kr
N. Elias-Rosa, S. D. Van Dyk, W. Li +13
We present early-time photometric and spectroscopic observations of supernova (SN) 2009kr in NGC 1832. We find that its properties to date support its classification as Type II-lin…
Long duration radio transients lacking optical counterparts are possibly Galactic Neutron Stars
E. O. Ofek, B. Breslauer, A. Gal-Yam +4
(abridged) Recently, a new class of radio transients in the 5-GHz band was detected by Bower et al. We present new deep near-Infrared (IR) observations of the field containing thes…
A census of AM CVn stars: three new candidates and one confirmed 48.3-minute binary
Arne Rau, Gijs H. A. Roelofs, Paul J. Groot +4
We present three new candidate AM CVn binaries, plus one confirmed new system, from a spectroscopic survey of color-selected objects from the Sloan Digital Sky Survey. All four sys…
The Palomar Transient Factory: System Overview, Performance and First Results
N. M. Law, S. R. Kulkarni, R. G. Dekany +38
The Palomar Transient Factory (PTF) is a fully-automated, wide-field survey aimed at a systematic exploration of the optical transient sky. The transient survey is performed using…
The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts
S. B. Cenko, D. A. Frail, F. A. Harrison +22
Long-duration gamma-ray bursts (GRBs) are widely believed to be highly-collimated explosions (opening angle theta ~ 1-10 deg). As a result of this beaming factor, the true energy r…
The Host Galaxies of Swift Dark Gamma-Ray Bursts: Observational Constraints on Highly Obscured and Very High-Redshift GRBs
D. A. Perley, S. B. Cenko, J. S. Bloom +13
In this work we present the first results of our imaging campaign at Keck Observatory to identify the host galaxies of "dark" gamma-ray bursts (GRBs), events with no detected optic…