The majority of bright gamma-ray transients that we observe in the sky, are produced by extragalactic gamma-ray bursts (GRBs). However, we know that there are other kinds of sources that can produce intense bursts of high-energy photons within our own Galaxy. GRB 070610/Swift J195509+261406, being just 1 degree away from the Galactic plane, is one

Estudio estadístico de poblaciones de cúmulos en galaxias interactuantes. Correlación de propiedades de dichos cúmulos junto con las características de la galaxia anfitrión. Implicaciones en la evolución de galaxias a través de la nueva población de cúmulos creada en la interacción.

The polarization analysis of light is typically carried out using modulation schemes. The light of an unknown polarization state is passed through a set of known modulation optics, and a detector is used to measure the total intensity passing the system. The modulation optics is modified several times, and, with the aid of several such measurements

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Dwarf-galaxy sized dark matter halos may be detectable when a bright background source is gravitationally lensed on scales of milliarcseconds. Such effects can be caused by dark galaxies as well as luminous ones. Here we discuss conditions for detecting a luminous lensing object through direct imaging, via measurements of the point spread function

The nature of the dark bursts is still not fully understood. Here, we report on some of our recent studies on Swift dark bursts. Thereby, we pay particular attention to GRB 050717, for which we obtained a deep imaging of the X-ray error circle with the newly commissioned GROND camera mounted at the 2.2 m telescope on La Silla.