We present a detailed report of the connection between long‐duration gamma‐ray bursts
(GRBs) and their accompanying supernovae (SNe). The discussion presented here places …

Our understanding of massive star evolution is in flux due to recent upheavals in our view of
mass loss and observations of a high binary fraction among O-type stars. Mass-loss rates for …

We present optical and ultraviolet spectra of the first electromagnetic counterpart to a
gravitational-wave (GW) source, the binary neutron star merger GW170817. Spectra were …

This is the second paper of a series in which we present new measurements of the observed
rates of supernovae (SNe) in the local Universe, determined from the Lick Observatory …

We present the densely sampled early light curve of the Type II supernova (SN) 2023ixf, first
observed within hours of explosion in the nearby Pinwheel Galaxy (Messier 101; 6.7 Mpc) …

We present observations of SN 2021csp, the second example of a newly identified type of
supernova (SN) hallmarked by strong, narrow, P Cygni carbon features at early times (Type …

We present ground-based optical and Hubble Space Telescope (HST) optical and near-IR
observations of the short-hard GRB 130603B at z= 0.356, which demonstrate the presence …

Wide-field optical surveys have begun to uncover large samples of fast (t rise≲ 5 d),
luminous (M peak<− 18), blue transients. While commonly attributed to the breakout of a …

We investigate the evolution of Type Ib/c supernova (SN Ib/c) progenitors in close binary
systems, using new evolutionary models that include the effects of rotation, with initial …

ABSTRACT The progenitors of Type Ia and some core collapse supernovae are thought to
be stars in binary systems, but little direct observational evidence exists to confirm the …