We present the results of a Palomar Transient Factory (PTF) archival search for blue transients that lie in the magnitude range between ``normal'' core-collapse and superluminous supernovae (i.e., with -21 <= M $_ R (peak)$ <= - 19). Of the six …
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 (duration >åisebox-0.5ex months), luminous X-ray (L $_X, iso$ ≈ 3 × …
We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar binaries with some of the smallest separations …
Context. In August 2008, the accreting milli-second X-ray pulsar (AMXP), IGR J00291+5934, underwent an outburst lasting åisebox-0.5ex 100 days, the first since its discovery in 2004. Aims: We present data from the 2008 double-peaked outburst of IGR …
The quasar SDSS J153636.22+044127.0, exhibiting peculiar broad emission- line profiles with multiple components, was proposed as a candidate sub-parsec binary supermassive black hole system. More recently, imaging revealed two spatially distinct …
We report on optical and near-infrared observations obtained during and after the 2004 December discovery outburst of the X-ray transient and accretion-powered millisecond pulsar IGR J00291+5934. Our observations monitored the evolution of the …
We present optical and infrared monitoring of the 2005 outburst of the halo black hole X-ray transient XTE J1118+480. We measured a total outburst amplitude of åisebox-0.5ex 5.7+/-0.1 mag in the R band and i̊sebox-0.5ex 5 mag in the infrared J, H, …