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Evidence for Type Ia Supernova Diversity from Ultraviolet Observations with the Hubble Space Telescope
Xiaofeng Wang, Lifan Wang, Alexei V. Filippenko +93
We present ultraviolet (UV) spectroscopy and photometry of four Type Ia supernovae (SNe 2004dt, 2004ef, 2005M, and 2005cf) obtained with the UV prism of the Advanced Camera for Sur…
Swift J2058.4+0516: Discovery of a Possible Second Relativistic Tidal Disruption Flare?
S. Bradley Cenko, Hans A. Krimm, Assaf Horesh +18
We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.4+0516 (Sw J2058+05). Our multi-wavelength follow-up campaign uncovered a long-lived (du…
An Updated Ultraviolet Calibration for the Swift/UVOT
A. A. Breeveld, W. Landsman, S. T. Holland +3
We present an updated calibration of the Swift/UVOT broadband ultraviolet (uvw1, uvm2, and uvw2) filters. The new calibration accounts for the ~1% per year decline in the UVOT sens…
GRB 081029: Understanding Multiple Afterglow Components
S. T. Holland, M. De Pasquale, J. Mao +9
We present an analysis of the unusual optical light curve of the gamma-ray burst GRB~081029, which occurred at a redshift of z = 3.8479$. We combine X-ray and optical observations…