Astrophysical: Gamma-ray sources

  • Publication
    Optical/near-IR observations of SGR 1900+14 during the May-June and Aug-Sep 1998 active periods
    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...
  • Publication
    Photometric study of the improved GRB 970815 error box
    An improved error box of GRB 970815 has been reported very recently (Smith et al.1999). This error box is consistent with the decaying X-ray source detected by...
  • Publication
    Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope
    We analyze the timing of photons observed by the MAGIC telescope during a flare of the active galactic nucleus Mkn 501 for a possible correlation with energy...
  • Publication
    Prompt Comparison of Data for Optical Transients of Gamma-Ray Bursts
    The prompt information given by the GRB Coordinates Network (GCN) differs very much for different GRBs. We compare the optical magnitudes quoted in GCNs for...
  • Publication
    Radio to γ-ray observations of 3C 454.3:1993-1995
    Results from a multiwaveband study of the γ-ray-bright compact radio source 3C 454.3 are presented.
  • Publication
    Recent optical/near-IR observations of GRBs
    We present the results of optical/near-IR observations carried out in the period Dec 1998-Dec 1999 at Spanish, Indian and New Zealand observatories. Most of the...
  • News
    SAMUEL TING: “If we find complete agreement with the theory, we don’t learn anything”
    “I still remember the surface of the Moon seen from the Teide Observatory”. He will never forget the image: Sharp, close up, and brilliant. It was the first...
  • News
    Takaaki Kajita: “The detection of gamma-rays with the CTA will be the key to discovering new sources of neutrino emission”
    The Japanese physicist Takaaki Kajita is one of the leading world experts in neutrino physics. These particles have a very tiny mass, and they hardly interact...
  • Publication
    The Epeakrest E correlation in GRBs in the BATSE catalog
    The energy emission involved in a Gamma-Ray Burst evidently can be estimated only provided that we know the distance to the source. The same is true for the...