Astrophysical: Gamma rays

  • Publication
    Observations of the Blazar 3C 66A with the Magic Telescopes in Stereoscopic Mode
    We report new observations of the intermediate-frequency peaked BL Lacertae object 3C 66A with the MAGIC telescopes. The data sample we use were taken in 2009...
  • Publication
    Observations of the Crab Nebula at TeV energies.
    The results of four years of observation of the Crab Nebula at TeV energies by the Whipple group are discussed and the status of the Crab Nebula as a standard...
  • Publication
    Observations of the Crab Pulsar between 25 and 100 GeV with the MAGIC I Telescope
    We report on the observation of γ-rays above 25 GeV from the Crab pulsar (PSR B0532+21) using the MAGIC I telescope. Two data sets from observations during the...
  • Publication
    Observations of the magnetars 4U 0142+61 and 1E 2259+586 with the MAGIC telescopes
    Context. Magnetars are an extreme, highly magnetized class of isolated neutron stars whose large X-ray luminosity is believed to be driven by their high...
  • Publication
    On the binary nature of the γ-ray sources AGL J2241+4454 (= MWC 656) and HESS J0632+057 (= MWC 148)
    We present optical spectroscopy of MWC 656 and MWC 148, the proposed optical counterparts of the γ-ray sources AGL J2241+4454 and HESS J0632+057, respectively...
  • Publication
    On the constraining observations of the dark GRB 001109 and the properties of a z = 0.398 radio selected starburst galaxy contained in its error box
    We present optical and NIR (near infrared) follow up observations of the GRB 001109 from 1 to 300 days after the burst. No transient emission was found at these...
  • Publication
    On the Progenitor of the Type Ic Supernova 2002ap
    This Letter presents wide-field optical and near-IR (UBVRIHαK') images of the galaxy M74 that were taken between 0.6 and 8.3 yr before the discovery of the Type...
  • Publication
    On the Redshift of TeV BL Lac Objects
    We report results of a spectroscopic campaign carried out at the 10 m Gran Telescopio Canarias for a sample of 22 BL Lac objects detected (or candidates) at TeV...
  • Publication
    Optical Follow-Up of GRB 970508
    We report on the results of optical follow-up observations of the counterpart of the gamma-ray burst GRB 970508, starting 7 hr after the event. Multicolor U-, B...