Andrei V. Berdyugin

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The processes e+e− → μ+μ− and e+e− → π+π− have been studied with SND detector at VEPP-2M e+e− collider in the vicinity of φ(1020) resonance. The branching ratios B(φ → μ+μ−) = (3.30 ± 0.45 ± 0.32) × 10−4 and B(φ → π+π−) = (0.71 ± 0.11 ± 0.09) × 10−4 were obtained.
Context. Gamma-ray bursts are cosmological sources emitting radiation from the gamma-rays to the radio band. Substantial observational efforts have been devoted to the study of gamma-ray bursts during the prompt phase, i.e. the initial burst of high-energy radiation, and during the longlasting afterglows. In spite of many successes in interpreting these(More)
We use 73 h of stereoscopic data taken with the MAGIC telescopes to investigate the very high-energy (VHE) gamma-ray emission of the Crab pulsar. Our data show a highly significant pulsed signal in the energy range from 50 to 400 GeV in both the main pulse (P1) and the interpulse (P2) phase regions. We provide the widest spectra to date of the VHE(More)
M.N. Achasov, V.M. Aulchenko, K.I. Beloborodov, A.V. Berdyugin, A.V. Bozhenok, A.D. Bukin, D.A. Bukin, S.V. Burdin, T.V. Dimova, S.I. Dolinsky, A.A. Drozdetsky, V.P. Druzhinin, M.S. Dubrovin, I.A. Gaponenko, V.B. Golubev, V.N. Ivanchenko, I.A. Koop, A.A. Korol, M.S. Korostelev, S.V. Koshuba, G.A. Kukartsev, E.V. Pakhtusova, V.M. Popov, A.A. Salnikov, S.I.(More)
Context. 3C 279, the first quasar discovered to emit VHE γ-rays by the MAGIC telescope in 2006, was reobserved by MAGIC in January 2007 during a major optical flare and from December 2008 to April 2009 following an alert from the Fermi space telescope on an exceptionally high γ-ray state. Aims. The January 2007 observations resulted in a detection on(More)
We report the first direct detection of an exoplanet in the visible polarized light. The transiting planet HD 189733b is one of the very hot Jupiters with shortest periods and, thus, smallest orbits, which makes them ideal candidates for polarimetric detections. We obtained polarimetric measurements of HD 189733 in the B band well distributed over the(More)
Context. The quasar-type blazar 3C 454.3 was observed to undergo an unprecedented optical outburst in spring 2005, affecting the source brightness from the near-IR to the X-ray frequencies. This was first followed by a millimetric and then by a radio outburst, which peaked in February 2006. Aims. In this paper we report on follow-up observations to study(More)
M.N.Achasov, 1 V.M.Aulchenko, S.E.Baru, K.I.Beloborodov, A.V.Berdyugin, A.G.Bogdanchikov, A.V.Bozhenok, A.D.Bukin, D.A.Bukin, S.V.Burdin, T.V.Dimova, S.I.Dolinsky, A.A.Drozdetsky, V.P.Druzhinin, M.S.Dubrovin, I.A.Gaponenko, V.B.Golubev, V.N.Ivanchenko, A.A.Korol, S.V.Koshuba, G.A.Kukartsev, E.V.Pakhtusova, V.M.Popov, A.A.Salnikov, S.I.Serednyakov,(More)
  • C. M. Raiteri, M. Villata, +65 authors A. Valcheva
  • 2009
Context. BL Lacertae is the prototype of the blazar subclass named after it. Yet, it has occasionally shown a peculiar behaviour that has questioned a simple interpretation of its broad-band emission in terms of synchrotron plus synchrotron self-Compton (SSC) radiation. Aims. In the 2007–2008 observing season we carried out a new multiwavelength campaign of(More)