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  • Author(s): Ackermann, M
  • Arcavi, I
  • Baldini, L
  • Ballet, J
  • Barbiellini, G
  • Bastieri, D
  • Bellazzini, R
  • Bissaldi, E
  • Blandford, RD
  • Bonino, R
  • Bottacini, E
  • Brandt, TJ
  • Bregeon, J
  • Bruel, P
  • Buehler, R
  • Buson, S
  • Caliandro, GA
  • Cameron, RA
  • Caragiulo, M
  • Caraveo, PA
  • Cavazzuti, E
  • Cecchi, C
  • Charles, E
  • Chekhtman, A
  • Chiang, J
  • Chiaro, G
  • Ciprini, S
  • Claus, R
  • Cohen-Tanugi, J
  • Cutini, S
  • D'Ammando, F
  • De Angelis, A
  • De Palma, F
  • Desiante, R
  • Di Venere, L
  • Drell, PS
  • Favuzzi, C
  • Fegan, SJ
  • Franckowiak, A
  • Funk, S
  • Fusco, P
  • Gal-Yam, A
  • Gargano, F
  • Gasparrini, D
  • Giglietto, N
  • Giordano, F
  • Giroletti, M
  • Glanzman, T
  • Godfrey, G
  • Grenier, IA
  • Grove, JE
  • Guiriec, S
  • Harding, AK
  • Hayashi, K
  • Hewitt, JW
  • Hill, AB
  • Horan, D
  • Jogler, T
  • Jóhannesson, G
  • Kocevski, D
  • Kuss, M
  • Larsson, S
  • Lashner, J
  • Latronico, L
  • Li, J
  • Li, L
  • Longo, F
  • Loparco, F
  • Lovellette, MN
  • Lubrano, P
  • Malyshev, D
  • Mayer, M
  • Mazziotta, MN
  • McEnery, JE
  • Michelson, PF
  • Mizuno, T
  • Monzani, ME
  • Morselli, A
  • Murase, K
  • Nugent, P
  • Nuss, E
  • Ofek, E
  • Ohsugi, T
  • Orienti, M
  • Orlando, E
  • Ormes, JF
  • Paneque, D
  • Pesce-Rollins, M
  • Piron, F
  • Pivato, G
  • Rainò, S
  • Rando, R
  • Razzano, M
  • Reimer, A
  • Reimer, O
  • Schulz, A
  • Sgrò, C
  • Siskind, EJ
  • Spada, F
  • Spandre, G
  • et al.

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Supernovae (SNe) exploding in a dense circumstellar medium (CSM) are hypothesized to accelerate cosmic rays in collisionless shocks and emit GeV γ-rays and TeV neutrinos on a timescale of several months. We perform the first systematic search for γ-ray emission in Fermi Large Area Telescope data in the energy range from to from the ensemble of 147 SNe Type IIn exploding in a dense CSM. We search for a γ-ray excess at each SNe location in a one-year time window. In order to enhance a possible weak signal, we simultaneously study the closest and optically brightest sources of our sample in a joint-likelihood analysis in three different time windows (1 year, 6 months, and 3 months). For the most promising source of the sample, SN 2010jl (PTF 10aaxf), we repeat the analysis with an extended time window lasting 4.5 years. We do not find a significant excess in γ-rays for any individual source nor for the combined sources and provide model-independent flux upper limits for both cases. In addition, we derive limits on the γ-ray luminosity and the ratio of γ-ray-to-optical luminosity ratio as a function of the index of the proton injection spectrum assuming a generic γ-ray production model. Furthermore, we present detailed flux predictions based on multi-wavelength observations and the corresponding flux upper limit at a 95% confidence level (CL) for the source SN 2010jl (PTF 10aaxf).

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