Discovery of VHE gamma-ray emission from the BL Lac object B3 2247+381 with the MAGIC telescopes
- The MAGIC Collaboration
- J. Aleksić(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- E. A. Alvarez(Universidad Complutense, E-28040 Madrid, Spain)
- L. A. Antonelli(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- P. Antoranz(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- M. Asensio(Universidad Complutense, E-28040 Madrid, Spain)
- M. Backes(Technische Universität Dortmund, D-44221 Dortmund, Germany)
- J. A. Barrio(Universidad Complutense, E-28040 Madrid, Spain)
- D. Bastieri(Universita di Padova and INFN, I-35131 Padova, Italy)
- J. Becerra González(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- W. Bednarek(University of Łodz, PL-90236 Lodz, Poland)
- A. Berdyugin(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- K. Berger(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- E. Bernardini(Deutsches Elektronen-Synchrotron)
- A. Biland(ETH Zurich, CH-8093 Zurich, Switzerland)
- O. Blanch(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- R. K. Bock(Max-Planck-Institut für Physik, D-80805 München, Germany)
- A. Boller(ETH Zurich, CH-8093 Zurich, Switzerland)
- G. Bonnoli(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- D. Borla Tridon(Max-Planck-Institut für Physik, D-80805 München, Germany)
- I. Braun(ETH Zurich, CH-8093 Zurich, Switzerland)
- T. Bretz(Universität Würzburg, D-97074 Würzburg, Germany)
- A. Cañellas(Universitat de Barcelona)
- E. Carmona(Max-Planck-Institut für Physik, D-80805 München, Germany)
- A. Carosi(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- P. Colin(Max-Planck-Institut für Physik, D-80805 München, Germany)
- E. Colombo(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- J. L. Contreras(Universidad Complutense, E-28040 Madrid, Spain)
- J. Cortina(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- L. Cossio(Universita di Udine, and INFN Trieste, I-33100 Udine, Italy)
- S. Covino(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- F. Dazzi(Universita di Udine, and INFN Trieste, I-33100 Udine, Italy)
- A. De Angelis(Universita di Udine, and INFN Trieste, I-33100 Udine, Italy)
- G. De Caneva(Deutsches Elektronen-Synchrotron)
- E. De Cea del Pozo(Institut de Ciencies de l'Espai)
- B. De Lotto(Universita di Udine, and INFN Trieste, I-33100 Udine, Italy)
- C. Delgado Mendez(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- A. Diago Ortega(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- M. Doert(Technische Universität Dortmund, D-44221 Dortmund, Germany)
- A. Domínguez(Inst. de Astrofisica de Andaluc\ia)
- D. Dominis Prester(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- D. Dorner(ETH Zurich, CH-8093 Zurich, Switzerland)
- M. Doro(Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain)
- D. Elsaesser(Universität Würzburg, D-97074 Würzburg, Germany)
- D. Ferenc(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- M. V. Fonseca(Universidad Complutense, E-28040 Madrid, Spain)
- L. Font(Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain)
- C. Fruck(Max-Planck-Institut für Physik, D-80805 München, Germany)
- R. J. García López(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- M. Garczarczyk(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- D. Garrido(Universitat Autonoma de Barcelona, E-08193 Bellaterra, Spain)
- G. Giavitto(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- N. Godinović(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- D. Hadasch(Institut de Ciencies de l'Espai)
- D. Häfner(Max-Planck-Institut für Physik, D-80805 München, Germany)
- A. Herrero(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- D. Hildebrand(ETH Zurich, CH-8093 Zurich, Switzerland)
- D. Höhne-Mönch(Universität Würzburg, D-97074 Würzburg, Germany)
- J. Hose(Max-Planck-Institut für Physik, D-80805 München, Germany)
- D. Hrupec(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- B. Huber(ETH Zurich, CH-8093 Zurich, Switzerland)
- T. Jogler(Max-Planck-Institut für Physik, D-80805 München, Germany)
- H. Kellermann(Max-Planck-Institut für Physik, D-80805 München, Germany)
- S. Klepser(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- T. Krähenbühl(ETH Zurich, CH-8093 Zurich, Switzerland)
- J. Krause(Max-Planck-Institut für Physik, D-80805 München, Germany)
- A. La Barbera(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- D. Lelas(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- E. Leonardo(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- E. Lindfors(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- S. Lombardi(Universita di Padova and INFN, I-35131 Padova, Italy)
- M. López(Universidad Complutense, E-28040 Madrid, Spain)
- A. López-Oramas(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- E. Lorenz(ETH Zurich, CH-8093 Zurich, Switzerland)
- M. Makariev(Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
- G. Maneva(Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
- N. Mankuzhiyil(Universita di Udine, and INFN Trieste, I-33100 Udine, Italy)
- K. Mannheim(Universität Würzburg, D-97074 Würzburg, Germany)
- L. Maraschi(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- M. Mariotti(Universita di Padova and INFN, I-35131 Padova, Italy)
- M. Martínez(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- D. Mazin(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- M. Meucci(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- J. M. Miranda(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- R. Mirzoyan(Max-Planck-Institut für Physik, D-80805 München, Germany)
- H. Miyamoto(Max-Planck-Institut für Physik, D-80805 München, Germany)
- J. Moldón(Universitat de Barcelona)
- A. Moralejo(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- P. Munar-Adrover(Universitat de Barcelona)
- D. Nieto(Universidad Complutense, E-28040 Madrid, Spain)
- K. Nilsson(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- R. Orito(Max-Planck-Institut für Physik, D-80805 München, Germany)
- I. Oya(Universidad Complutense, E-28040 Madrid, Spain)
- D. Paneque(Max-Planck-Institut für Physik, D-80805 München, Germany)
- R. Paoletti(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- S. Pardo(Universidad Complutense, E-28040 Madrid, Spain)
- J. M. Paredes(Universitat de Barcelona)
- S. Partini(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- M. Pasanen(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- F. Pauss(ETH Zurich, CH-8093 Zurich, Switzerland)
- M. A. Perez-Torres(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- M. Persic(Universita di Udine, and INFN Trieste, I-33100 Udine, Italy)
- L. Peruzzo(Universita di Padova and INFN, I-35131 Padova, Italy)
- M. Pilia(Universita dell Insubria, Como, I-22100 Como, Italy)
- J. Pochon(Inst. de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Spain)
- F. Prada(Inst. de Astrofisica de Andaluc\ia)
- P. G. Prada Moroni(Universita di Pisa, and INFN Pisa, I-56126 Pisa, Italy)
- E. Prandini(Universita di Padova and INFN, I-35131 Padova, Italy)
- I. Puljak(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- I. Reichardt(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- R. Reinthal(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- W. Rhode(Technische Universität Dortmund, D-44221 Dortmund, Germany)
- M. Ribó(Universitat de Barcelona)
- J. Rico(ICREA, E-08010 Barcelona, Spain)
- S. Rügamer(Universität Würzburg, D-97074 Würzburg, Germany)
- A. Saggion(Universita di Padova and INFN, I-35131 Padova, Italy)
- K. Saito(Max-Planck-Institut für Physik, D-80805 München, Germany)
- T. Y. Saito(Max-Planck-Institut für Physik, D-80805 München, Germany)
- M. Salvati(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- K. Satalecka(Universidad Complutense, E-28040 Madrid, Spain)
- V. Scalzotto(Universita di Padova and INFN, I-35131 Padova, Italy)
- V. Scapin(Universidad Complutense, E-28040 Madrid, Spain)
- C. Schultz(Universita di Padova and INFN, I-35131 Padova, Italy)
- T. Schweizer(Max-Planck-Institut für Physik, D-80805 München, Germany)
- M. Shayduk(Max-Planck-Institut für Physik, D-80805 München, Germany)
- S. N. Shore(Universita di Pisa, and INFN Pisa, I-56126 Pisa, Italy)
- A. Sillanpää(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- J. Sitarek(University of Łodz, PL-90236 Lodz, Poland)
- I. Snidaric(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- D. Sobczynska(University of Łodz, PL-90236 Lodz, Poland)
- F. Spanier(Universität Würzburg, D-97074 Würzburg, Germany)
- S. Spiro(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- V. Stamatescu(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- A. Stamerra(Universita di Siena, and INFN Pisa, I-53100 Siena, Italy)
- B. Steinke(Max-Planck-Institut für Physik, D-80805 München, Germany)
- J. Storz(Universität Würzburg, D-97074 Würzburg, Germany)
- N. Strah(Technische Universität Dortmund, D-44221 Dortmund, Germany)
- T. Surić(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- L. Takalo(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- H. Takami(Max-Planck-Institut für Physik, D-80805 München, Germany)
- F. Tavecchio(INAF National Institute for Astrophysics, I-00136 Rome, Italy)
- P. Temnikov(Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
- T. Terzić(Croatian MAGIC Consortium, Rudjer Boskovic Institute, University of Rijeka and University of Split, HR-10000 Zagreb, Croatia)
- D. Tescaro(Universita di Pisa, and INFN Pisa, I-56126 Pisa, Italy)
- M. Teshima(Max-Planck-Institut für Physik, D-80805 München, Germany)
- O. Tibolla(Universität Würzburg, D-97074 Würzburg, Germany)
- D. F. Torres(ICREA, E-08010 Barcelona, Spain)
- A. Treves(Universita dell Insubria, Como, I-22100 Como, Italy)
- M. Uellenbeck(Technische Universität Dortmund, D-44221 Dortmund, Germany)
- H. Vankov(Inst. for Nucl. Research and Nucl. Energy, BG-1784 Sofia, Bulgaria)
- P. Vogler(ETH Zurich, CH-8093 Zurich, Switzerland)
- R. M. Wagner(Max-Planck-Institut für Physik, D-80805 München, Germany)
- Q. Weitzel(ETH Zurich, CH-8093 Zurich, Switzerland)
- V. Zabalza(Universitat de Barcelona)
- F. Zandanel(Inst. de Astrofisica de Andaluc\ia)
- R. Zanin(IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra, Spain)
- V. Kadenius(Tuorla Observatory, University of Turku, FI-21500 Piikkio, Finland)
- M. Weidinger(Universität Würzburg, D-97074 Würzburg, Germany)
- S. Buson(Instituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, Italy)
Publication date
October 2015
DOIAbstract
We study the non-thermal jet emission of the BL Lac object B3 2247+381 during a high optical state. The MAGIC telescopes observed the source during 13 nights between September 30th and October 30th 2010, collecting a total of 14.2 hours of good quality very high energy (VHE) $\gamma$-ray data. Simultaneous multiwavelength data was obtained with X-ray observations by the Swift satellite and optical R-band observations at the KVA-telescope. We also use high energy $\gamma$-ray (HE, 0.1 GeV-100 GeV) data from the Fermi satellite. The BL Lac object B3 2247+381 (z=0.119) was detected, for the first time, at VHE $\gamma$-rays at a statistical significance of 5.6 $\sigma$. A soft VHE spectrum with a photon index of -3.2 $\pm$ 0.6 was determined. N...
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