ACKERMANN, Markus; AJELLO, Marco; BALDINI, Luca; BALLET, Jean; BARBIELLINI, Guido; G. BARING, M.; BASTIERI, D.; BECHTOL, K.; BELLAZZINI, R.; BERENJI, B.; N. BHAT, P.; BISSALDI, E.; D. BLANDFORD, R.; BONAMENTE, E.; W. BORGLAND, A.; BOUVIER, A.; BREGEON, J.; BREZ, A.; S. BRIGGS, M.; BRIGIDA, M.; BRUEL, Pascal; BUEHLER, R.; BUSON, S.; A. CALIANDRO, G.; A. CAMERON, R.; CARAVEO, P. A.; CARRIGAN, S.; M. CASANDJIAN, J.; CECCHI, C.; CHARLES, E.; CHEKHTMAN, A.; CHIANG, J.; CIPRINI, S.; CLAUS, R.; COHEN-TANUGI, J.; CONNAUGHTON, V.; CONRAD, J.; CUTINI, S.; D. DERMER, C.; DE ANGELIS, A.; DE PALMA, F.; W. DIGEL, S.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; FAVUZZI, C.; J. FEGAN, S.; C. FERRARA, E.; FRAILIS, M.; FUKAZAWA, Y.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIGLIETTO, N.; GIOMMI, P.; GIORDANO, F.; GIROLETTI, M.; GLANZMAN, T.; GODFREY, G.; GRANOT, J.; A. GRENIER, I.; E. GROVE, J.; GUILLEMOT, L.; GUIRIEC, S.; HADASCH, D.; HAYS, E.; HORAN, D.; E. HUGHES, R.; JOHANNESSON, G.; S. JOHNSON, A.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; M. KIPPEN, R.; KNÖDLSEDER, Jürgen; KOCEVSKI, D.; KUSS, M.; LANDE, J.; LATRONICO, L.; LEE, S.-H.; LLENA GARDE, M.; LONGO, F.; LOPARCO, F.; N. LOVELLETTE, M.; LUBRANO, P.; MAKEEV, A.; N. MAZZIOTTA, M.; MCBREEN, S.; E. MCENERY, J.; MCGLYNN, S.; MEEGAN, C.; MEHAULT, J.; MESZAROS, P.; F. MICHELSON, P.; MIZUNO, T.; A. MOISEEV, A.; MONTE, C.; E. MONZANI, M.; MORETTI, E.; MORSELLI, A.; V. MOSKALENKO, I.; MURGIA, S.; NAKAJIMA, H.; NAKAMORI, T.; NAUMANN-GODO, M.; L. NOLAN, P.; P. NORRIS, J.; NUSS, E.; OHNO, M.; OHSUGI, T.; OKUMURA, A.; OMODEI, N.; ORLANDO, E.; F. ORMES, J.; OZAKI, M.; S. PACIESAS, W.; PANEQUE, D.; H. PANETTA, J.; PARENT, D.; PELASSA, V.; PEPE, M.; PESCE-ROLLINS, M.; PETROSIAN, V.; PIRON, F.; PORTER, T.A.; PREECE, R.; L. RACUSIN, J.; RAINO, S.; RANDO, R.; RAU, A.; RAZZANO, M.; RAZZAQUE, S.; REIMER, A.; REIMER, O.; RIPKEN, J.; ROTH, M.; RYDE, F.; F.-W. SADROZINSKI, H.; SANDER, A.; D. SCARGLE, J.; L. SCHALK, T.; SGRO, C.; J. SISKIND, E.; D. SMITH, P.; SPANDRE, G.; SPINELLI, P.; STAMATIKOS, M.; S. STRICKMAN, M.; J. SUSON, D.; TAJIMA, H.; TAKAHASHI, H.; TANAKA, T.; B. THAYER, J.; G. THAYER, J.; TIBALDO, L.; F. TORRES, D.; TOSTI, G.; TRAMACERE, A.; UEHARA, T.; L. USHER, T.; VANDENBROUCKE, J.; J. VAN DER HORST, A.; VASILEIOU, V.; VILCHEZ, N.; VITALE, V.; VON KIENLIN, A.; P. WAITE, A.; WANG, P.; WILSON-HODGE, C.; L. WINER, B.; S. WOOD, K.; F. WU, X.; YAMAZAKI, R.; YANG, Z.; YLINEN, T.; ZIEGLER, M.

doi:10.1088/2041-8205/717/2/L127

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The Astrophysical journal letters. 2010-07-10, vol. 717, p. L127-L132

Bristol : IOP Publishing

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The Fermi observatory is advancing our knowledge of Gamma-Ray Bursts (GRBs) through pioneering observations at high energies, covering more than 7 decades in energy with the two on-board detectors, the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). Here we report on the observation of the long GRB 090217A which triggered the GBM and has been detected by the LAT with a significance greater than 9 sigma. We present the GBM and LAT observations and on-ground analyses, including the time-resolved spectra and the study of the temporal profile from 8 keV up to 1 GeV. All spectra are well reproduced by a Band model. We compare these observations to the first two LAT-detected, long bursts GRB 080825C and GRB 080916C. These bursts were found to have time-dependent spectra and exhibited a delayed onset of the high-energy emission, which are not observed in the case of GRB 090217A. We discuss some theoretical implications for the high-energy emission of GRBs.< Réduire

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gamma-ray burst: individual (GRB090217A)

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Fermi observations of high-energy gamma-ray emission from GRB 090217A

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