Usually, Cherenkov telescopes are used to observe sources which are well established in other wavelength bands. The limited sensitivity of present instruments leads to the fact that most of the sky has never been examined in the TeV band. The HEGRA stereoscopic IACT system is for the first time able to perform scans of extended sky regions with a sensitivity for point sources well below the Cra...

The supernova SN 2006aj associated with GRB 060218 is the second-closest GRB-SN observed to date (z=0.033). We present Very Large Telescope, Liverpool Telescope, and Katzman Automatic Imaging Telescope multi-color photometry of SN 2006aj. This supernova is found to be subluminous and rapidly evolving. Its early light curve includes an additional wavelength-dependent component, which can be inte...