Very high energy gamma-ray observation of the peculiar transient event Swift J1644+57 with the MAGIC telescopes and AGILE
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Authors
Aleksic, J.
Antonelli, L.
Antoranz, P.
Asensio, M.
Backes, M.
Barres de Almeida, U.
Barrio, J.
Becerra Gonzalez, J.
Bednarek, W.
Berger, K.
Bernardini, E.
Biland, A.
Blanch, O.
Bock, R.
Boller, A.
Bonnefoy, S.
Bonnoli, G.
Borla Tridon, D.
Bretz, T.
Carmona, E.
Carosi, A.
Carreto Fidalgo, D.
Colin, P.
Colombo, E.
Contreras, J.
Cortina, J.
Covino, S.
Da Vela, P.
Dazzi, F.
de Angelis, A.
De Caneva, G.
De Lotto, B.
Delgado Mendez, C.
Doert, M.
Dominguez, A.
Dominis Prester, D.
Dorner, D.
Doro, M.
Eisenacher, D.
Elsaesser, D.
Farina, E.
Ferenc, D.
Fonseca, M.
Font, L.
Fruck, C.
Garcia Lopez, R.
Garczarczyk, M.
Garrido Terrats, D.
Gaug, M.
Giavitto, G.
Godinovic, N.
Gonzalez Munoz, A.
Gozzini, S.
Hadamek, A.
Hadasch, D.
Herrero, A.
Hose, J.
Hrupec, D.
Idec, W.
Jankowski, F.
Kadenius, V.
Klepser, S.
Knoetig, M.
Krahenbuhl, T.
Krause, J.
Kushida, J.
La Barbera, A.
Lelas, D.
Lewandowska, N.
Lindfors, E.
Lombardi, S.
Lopez, M.
Lopez-Coto, R.
Lopez-Oramas, A.
Lorenz, E.
Lozano, I.
Makariev, M.
Mallot, K.
Maneva, G.
Mankuzhiyil, N.
Mannheim, K.
Maraschi, L.
Marcote, B.
Mariotti, M.
Martínez, M.
Masbou, J.
Mazin, D.
Meucci, M.
Miranda, J.
Mirzoyan, R.
Moldon, J.
Moralejo, A.
Munar-Adrover, P.
Nakajima, D.
Niedzwiecki, A.
Nilsson, K.
Nowak, N.
Orito, R.
Paiano, S.
Palatiello, M.
Paneque, D.
Paoletti, D.
Paredes, J.
Partini, S.
Persic, M.
Prada, F.
Prada Moroni, P.
Prandini, E.
Puljak, I.
Reichardt, I.
Reinthal, R.
Rhode, W.
Ribo, M.
Rico, J.
Saggion, A.
Saito, K.
Saito, T.
Salvati, M.
Satalecka, K.
Scalzotto, V.
Scapin, V.
Schultz, C.
Schweizer, T.
Shore, S.
Sillanpaa, A.
Sitarek, J.
Snidaric, I.
Sobczynska, D.
Spanier, F.
Spiro, S.
Stamatescu, V.
Stamerra, A.
Steinke, B.
Storz, J.
Sun, S.
Suric, T.
Takalo, L.
Takami, H.
Tavecchio, F.
Temnikov, P.
Terzic, T.
Tescaro, D.
Teshima, M.
Tibolla, Omar
Torres, D.
Toyama, T.
Treves, A.
Uellenbeck, M.
Vogler, P.
Wagner, R.
Weitzel, Q.
Zandanel, F.
Zanin, R.
Longo, F.
Lucarelli, F.
Pittori, C.
Verrecchia, F.
Date
2013Type
Journal Article
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Aleksic, J. and Antonelli, L. and Antoranz, P. and Asensio, M. and Backes, M. and Barres de Almeida, U. and Barrio, J. et al. 2013. Very high energy gamma-ray observation of the peculiar transient event Swift J1644+57 with the MAGIC telescopes and AGILE. Astronomy and Astrophysics. 552: pp. 1-6.
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Astronomy and Astrophysics
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Abstract
Context. On March 28, 2011, the BAT instrument on board the Swift satellite detected a new transient event that in the very beginning was classifiedas a gamma ray burst (GRB). However, the unusual X-ray flaring activity observed from a few hours up to days after the onset of the event madea different nature seem to be more likely. The long-lasting activity in the X-ray band, followed by a delayed brightening of the source in infraredand radio activity, suggested that it is better interpreted as a tidal disruption event that triggered a dormant black hole in the nucleus of the hostgalaxy and generated an outflowing jet of relativistic matter.Aims. Detecting a very high energy emission component from such a peculiar object would be enable us to constrain the dynamic of the emissionprocesses and the jet model by providing information on the Doppler factor of the relativistic ejecta .Methods. The MAGIC telescopes observed the peculiar source Swift J1644+57 during the flaring phase, searching for gamma-ray emission atvery-high energy (VHE, E > 100 GeV), starting observations nearly 2.5 days after the trigger time. MAGIC collected a total of 28 h of dataduring 12 nights. The source was observed in wobble mode during dark time at a mean zenith angle of 35?. Data were reduced using a newimage-cleaning algorithm, the so-called sum-cleaning, which guarantees a better noise suppression and a lower energy threshold than the standardanalysis procedure.Results. No clear evidence for emission above the energy threshold of 100 GeV was found. MAGIC observations permit one to constrain theemission from the source down to 100 GeV, which favors models that explain the observed lower energy variable emission. Data analysis ofsimultaneous observations from AGILE, Fermi and VERITAS also provide negative detection, which additionally constrain the self-Comptonemission component.
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