An international collaboration of fourty scientists have been involved in multifrequency observations of the blazar OJ 287, as well as of a few other...

We analyzed the longest phase-connected photometric dataset available for NGC 1313 X-2, looking for the ˜6 day modulation reported by Liu et al. (2009). The...

Variability studies of blazars have identified in the past hints of quasi-periodic emission for different sources, although strong evidences are still lacking...

This paper introduces a new technique for performing binary adaptive optics using optical components only, without the help of any electronic, or optoelectronic...

We present optical- near infrared photometry of the peculiar Galactic globular cluster NGC 6441. By using the K-band Period-Luminosity-Metallicity (PLZK) of its...

The transient black hole candidate GX 339-4 is currently softening in X-ray, making a transition out of the hard state (ATel #2545). We are monitoring the...

We present the results of optical/IR observations obtained in the period June-October 1998. Images in the Gunn-z band were serendipitously taken just 3 days...

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Elmer is a visible imager and spectrograph for the Gran Telescopio Canarias, which has been designed in-house. The major features and some of the analysis done...