1. Searching for decaying axionlike dark matter from clusters of galaxies.

    Physical Review Letters 99(13):131301 (2007) PMID 17930573

    We constrain the lifetime of radiatively decaying dark matter in clusters of galaxies inspired by generic Kaluza-Klein axions, which have been invoked as a possible explanation for the solar coronal x-ray emission. These particles can be produced inside stars and remain confined by the gravitati...
  2. The optical afterglow of the short gamma-ray burst GRB 050709.

    Nature 437(7060):859 (2005) PMID 16208365

    It has long been known that there are two classes of gamma-ray bursts (GRBs), mainly distinguished by their durations. The breakthrough in our understanding of long-duration GRBs (those lasting more than approximately 2 s), which ultimately linked them with energetic type Ic supernovae, came fro...
  3. Small-scale variations in the radiating surface of theGRB 011211jet

    New Astronomy 9(6):435 (2004)

    We report the discovery of the afterglow of the X-ray rich, long-duration γ-ray burst GRB 011211 and present evidence for oscillatory behaviour in its early optical light curve. The time-scale of the fluctuations, ∼1 h, is much smaller than the time of the observations, ∼12 h from th...
  4. A very energetic supernova associated with the gamma-ray burst of 29 March 2003.

    Nature 423(6942):847 (2003) PMID 12815425

    Over the past five years evidence has mounted that long-duration (>2 s) gamma-ray bursts (GRBs)-the most luminous of all astronomical explosions-signal the collapse of massive stars in our Universe. This evidence was originally based on the probable association of one unusual GRB with a supernov...