A search for optical bursts from the rotating radio transient J1819−1458 with ULTRACAM - II. Simultaneous ULTRACAM-Lovell Telescope observations

A search for optical bursts from the rotating radio transient J1819–1458 with ULTRACAM

We report on the search for optical bursts from J1819–1458, a member of the recently discovered Rotating Radio Transients (RRATs). J1819–1458 exhibits 3 millisecond bursts with a peak flux of f ν = 3.6 Jy every ∼ 3.4 minutes, implying that it is visible for only ∼ 1 second per day at radio wavelengths. Assuming that the optical light behaves in a similar manner, the most sensitive way of detect...

Multicolour observations of V404Cyg with ULTRACAM

We present high time-resolution multicolour observations of the quiescent soft Xray transient V404Cyg obtained with ULTRACAM . Superimposed on the secondary star’s ellipsoidal modulation are large flares on timescales of a few hours, as well as several distinct rapid flares on timescales of tens of mins. The rapid flares, most of which show further variability and unresolved peaks, cover shorte...

Observations of Ultracool dwarfs with ultracam on the vlt: a search for weather

We present multi-colour photometry of four field ultracool dwarfs with the triple-beam photometer ultracam. Data were obtained simultaneously in the Sloan-g band and a specially designed narrow-band NaI filter. The previously reported 1.8-hr period of Kelu-1 is here recovered in the g-band, but the lack of any significant variability in the NaI light of this object precludes any conclusion as t...

ULTRACAM observations of the black hole X - ray transient XTE J 1118 + 480 in quiescence

We present high time-resolution multicolour observations of the quiescent soft X-ray transient XTEJ1118+480 obtained with ULTRACAM. Superimposed on the double-humped continuum g ′ and i -band lightcurves are rapid flare events which typically last a few minutes. The power density spectrum of the lightcurves can be described by a broken power–law model with a break frequency at ∼2mHz or a power–...

UltraCam Photogrammetric Digital Aerial Cameras