ACKERMANN, Markus; AJELLO, Marco; ASANO, K.; AXELSSON, Magnus; 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.; ÇELIK, Ö.; CHAPLIN, V.; 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.; L. DINGUS, B.; DO COUTO E SILVA, E.; S. DRELL, P.; DUBOIS, R.; FAVUZZI, C.; J. FEGAN, S.; C. FERRARA, E.; B. FOCKE, W.; FRAILIS, M.; FUKAZAWA, Y.; FUNK, S.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GEHRELS, N.; GERMANI, S.; GIGLIETTO, N.; GIORDANO, F.; GIROLETTI, M.; GLANZMAN, T.; GODFREY, G.; GOLDSTEIN, A.; GRANOT, J.; GREINER, J.; A. GRENIER, I.; E. GROVE, J.; GUIRIEC, S.; HADASCH, D.; HANABATA, Y.; K. HARDING, A.; HAYASHI, K.; HAYASHIDA, M.; HAYS, E.; HORAN, D.; E. HUGHES, R.; ITOH, R.; JÓHANNESSON, G.; S. JOHNSON, A.; N. JOHNSON, W.; KAMAE, T.; KATAGIRI, H.; KATAOKA, J.; M. KIPPEN, R.; KNÖDLSEDER, Jürgen; KOCEVSKI, D.; KOUVELIOTOU, C.; 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.; MÉSZÁROS, P.; F. MICHELSON, P.; MIZUNO, T.; MONTE, C.; E. MONZANI, M.; MORETTI, E.; MORSELLI, A.; V. MOSKALENKO, I.; MURGIA, S.; NAKAJIMA, H.; NAKAMORI, T.; NAUMANN-GODO, M.; NISHINO, S.; 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.; RAINÒ, S.; RANDO, R.; RAU, A.; RAZZANO, M.; RAZZAQUE, S.; REIMER, A.; REIMER, O.; REPOSEUR, T.; C. REYES, L.; RIPKEN, J.; RITZ, S.; ROTH, M.; RYDE, F.; F.-W. SADROZINSKI, H.; SANDER, A.; D. SCARGLE, J.; L. SCHALK, T.; SGRÒ, C.; J. SISKIND, E.; D. SMITH, P.; SPANDRE, G.; SPINELLI, P.; STAMATIKOS, M.; W. STECKER, F.; S. STRICKMAN, M.; J. SUSON, D.; TAJIMA, H.; TAKAHASHI, H.; TANAKA, T.; TANAKA, Y.; B. THAYER, J.; G. THAYER, J.; TIBALDO, L.; TIERNEY, D.; TOMA, K.; F. TORRES, D.; TOSTI, G.; TRAMACERE, A.; UCHIYAMA, Y.; 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:10.1088/0004-637X/729/2/114

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The Astrophysical Journal. 2011-03-10, vol. 729, p. 114

American Astronomical Society

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We report on the observation of the bright, long gamma-ray burst, GRB 090926A, by the Gamma-ray Burst Monitor (GBM) and Large Area Telescope (LAT) instruments on board the \Fermi\ Gamma-ray Space Telescope. GRB 090926A shares several features with other bright LAT bursts. In particular, it clearly shows a short spike in the light curve that is present in all detectors that see the burst, and this in turn suggests that there is a common region of emission across the entire \Fermi\ energy range. In addition, while a separate high-energy power-law component has already been observed in other GRBs, here we report for the first time the detection with good significance of a high-energy spectral break (or cutoff) in this power-law component around 1.4 GeV in the time-integrated spectrum. If the spectral break is caused by opacity to electron-positron pair production within the source, then this observation allows us to compute the bulk Lorentz factor for the outflow, rather than a lower limit.< Réduire

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gamma-ray burst: individual (GRB 090926A)

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Detection of a spectral break in the extra hard component of GRB 090926A

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