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The Population of Helium-Merger Progenitors: Observational Predictions
C. L. Fryer, K. Belczynski, E. Berger +3
The helium-merger gamma-ray burst progenitor is produced by the rapid accretion onto a compact remnant (neutron star or black hole) when it undergoes a common envelope inspiral wit…
The Unusually Luminous Extragalactic Nova SN 2010U
Ian Czekala, E. Berger, R. Chornock +10
We present observations of the unusual optical transient SN 2010U, including spectra taken 1.03 days to 15.3 days after maximum light that identify it as a fast and luminous Fe II…
Pulsations in Short GRBs from Black Hole-Neutron Star Mergers
Nicholas Stone, Abraham Loeb, Edo Berger
The precise origin of short gamma ray bursts (SGRBs) remains an important open question in relativistic astrophysics. Increasingly, observational evidence suggests the merger of a…
Host Galaxy Properties of the Subluminous GRB 120422A/SN 2012bz
Emily M. Levesque, Ryan Chornock, Alicia M. Soderberg +2
GRB 120422A is a nearby (z = 0.283) long-duration GRB (LGRB) detected by Swift with E(gamma,iso) ~ 4.5\times1049 erg. It is also associated with the spectroscopically-confirmed bro…
A Spectroscopic Study of Type Ibc Supernova Host Galaxies from Untargeted Surveys
Nathan E. Sanders, Alicia M. Soderberg, Emily M. Levesque +8
We present the largest spectroscopic study of the host environments of Type Ibc supernovae (SN Ibc) discovered exclusively by untargeted SN searches. Past studies of SN Ibc host en…
A Jet Break in the X-ray Light Curve of Short GRB 111020A: Implications for Energetics and Rates
Wen-fai Fong, Edo Berger, Raffaella Margutti +8
We present broad-band observations of the afterglow and environment of the short GRB 111020A. An extensive X-ray light curve from Swift/XRT, XMM-Newton and Chandra, spanning ~100 s…