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

G. Baring, M.; Mg, Baring; N. Bhat, P.; Ackermann, M.; Ajello M.; /Stanford U. HEPL /KIPAC Menlo Park /SLAC /Stanford U. Phys Dept.;Asano K.; /RLNR Tokyo;Axelsson M.; /Stockholm U. /Lund Observ. /Stockholm U. OKC;Baldini L.; /INFN Pisa;Ballet J.; /AIM Saclay;Barbiellini G.; /INFN Trieste /Trieste U.;Baring; D. Blandford, R.; Pn, Bhat; Ajello, Marco; Rd, Blandford; Asano, K.; W. Borgland, A.; S. Briggs, M.; Axelsson, Magnus; Baldini, L.; M. Casandjian, J.; Ga, Caliandro; Ballet, J.; Ra, Cameron; Barbiellini, G.; Pa, Caraveo; Bellazzini, R.; Baring, Mg G.; Berenji, B.; Bastieri, D.; Bhat, P. N.; Jm, Casandjian; Bechtol, K.; Bissaldi, E.; Blandford, R. D.; Celik, O.; Bonamente, E.; Borgland, A. W.; Bouvier, A.; Bregeon, J.; Celik, . .; Brez, A.; Briggs, M. S.; D. Dermer, C.; Brigida, M.; Bruel, P.; L. Dingus, B.; Buehler, R.; Buson, S.; Do Couto E. Silva, E.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Carrigan, S.; S. Drell, P.; Casandjian, J. M.; Cecchi, C.; Cd, Dermer; Çelik, Ö.; Chaplin, V.; J. Fegan, S.; Charles, E.; Palma, F. .; Chekhtman, A.; Chiang, J.; C. Ferrara, E.; Ciprini, S.; Claus, R.; Bl, Dingus; Cohen-Tanugi, J.; Connaughton, V.; Edce, Silva; Conrad, J.; Ps, Drell; Cutini, S.; Sj, Fegan; Ec, Ferrara; de Angelis, A.; de Palma, F.; Wb, Focke; Dingus, B. L.; E. Grove, J.; Drell, P. S.; K. Harding, A.; Dubois, R.; Favuzzi, C.; Dermer, C. D.; Fegan, S. J.; Ferrara, E. C.; Focke, W. B.; Frailis, M.; E. Hughes, R.; Fukazawa, Y.; Silva, Do Couto E. E.; Funk, S.; Fusco, P.; Gargano, F.; S. Johnson, A.; Gasparrini, D.; Ia, Grenier; Gehrels, N.; Germani, S.; Je, Grove; Giglietto, N.; N. Johnson, W.; Giordano, F.; Giroletti, M.; Glanzman, T.; M. Kippen, R.; Godfrey, G.; Goldstein, A.; Granot, J.; Re, Hughes; Greiner, J.; Johannesson, G.; Grenier, I. A.; Grove, J. E.; N. Lovellette, M.; Guiriec, S.; Hadasch, D.; Knödlseder, J.; Hanabata, Y.; Harding, A. K.; Wn, Johnson; Hayashi, K.; N. Mazziotta, M.; Hayashida, M.; Hays, E.; E. Mcenery, J.; Horan, D.; Hughes, R. E.; Rm, Kippen; Itoh, R.; Jóhannesson, G.; F. Michelson, P.; Johnson, A. S.; Sh, Lee; Johnson, W. N.; Kamae, T.; Mcbreen, S.; Katagiri, H.; Kataoka, J.; Ml, Garde; Kippen, R. M.; Knodlseder, J.; E. Monzani, M.; Kocevski, D.; Mcglynn, S.; Kouveliotou, C.; Kuss, M.; Mn, Lovellette; Lande, J.; Latronico, L.; V. Moskalenko, I.; Lee, S.-H.; Llena Garde, M.; Mn, Mazziotta; Longo, F.; Je, Mcenery; Loparco, F.; Lovellette, M. N.; Meszaros, P.; Lubrano, P.; Makeev, A.; L. Nolan, P.; Mazziotta, M. N.; Pf, Michelson; P. Norris, J.; McEnery, J. E.; Me, Monzani; F. Ormes, J.; Meegan, C.; Pl, Nolan; Mehault, J.; Mészáros, P.; Jp, Norris; Michelson, P. F.; Mizuno, T.; S. Paciesas, W.; Monte, C.; Monzani, M. E.; H. Panetta, J.; Moretti, E.; Jf, Ormes; Morselli, A.; Moskalenko, I. V.; Ws, Paciesas; Murgia, S.; Nakajima, H.; L. Racusin, J.; Nakamori, T.; Naumann-Godo, M.; Jh, Panetta; Nishino, S.; Garde, Llena M. .; Nolan, P. L.; Norris, J. P.; Ta, Porter; Nuss, E.; Ohno, M.; C. Reyes, L.; Ohsugi, T.; Okumura, A.; Jl, Racusin; Omodei, N.; F.-W. Sadrozinski, H.; Orlando, E.; Ormes, J. F.; D. Scargle, J.; Ozaki, M.; Paciesas, W. S.; L. Schalk, T.; Paneque, D.; Panetta, J. H.; Lc, Reyes; Parent, D.; J. Siskind, E.; Pelassa, V.; Pepe, M.; D. Smith, P.; Pesce-Rollins, M.; Petrosian, V.; W. Stecker, F.; Piron, F.; Porter, T. A.; Hfw, Sadrozinski; Preece, R.; S. Strickman, M.; Racusin, J. L.; Rainò, S.; J. Suson, D.; Rando, R.; Rau, A.; Dj, Suson; Razzano, M.; Razzaque, S.; Knoedlseder, J.; Reimer, A.; Reimer, O.; G. Thayer, J.; Reposeur, T.; Reyes, L. C.; Jb, Thayer; Ripken, J.; Ritz, S.; Jg, Thayer; Roth, M.; Ryde, F.; F. Torres, D.; Sadrozinski, H. F.-W.; Df, Torres; Sander, A.; Scargle, J. D.; L. Usher, T.; Schalk, T. L.; Sgrò, C.; Tl, Usher; Siskind, E. J.; Smith, P. D.; J. Van Der Horst, A.; Spandre, G.; Van, A. J.; Spinelli, P.; Stamatikos, M.; Von Kienlin, A.; Stecker, F. W.; Strickman, M. S.; P. Waite, A.; Suson, D. J.; Tajima, H.; Kienlin, A. .; Takahashi, H.; L. Winer, B.; Tanaka, T.; Tanaka, Y.; Bl, Winer; Thayer, J. B.; Thayer, J. G.; S. Wood, K.; Tibaldo, L.; Tierney, D.; F. Wu, X.; Toma, K.; Ks, Wood; Torres, D. F.; Tosti, G.; Xf, Wu; Tramacere, A.; Uchiyama, Y.; Others,; Uehara, T.; Usher, T. L.; Aw, Borgland; Vandenbroucke, J.; A. Caliandro, G.; van der Horst, A. J.; A. Cameron, R.; Vasileiou, V.; A. Caraveo, P.; Vilchez, N.; Vitale, V.; Angelis, A. .; Waite, A. P.; B. Focke, W.; Wang, P.; A. Grenier, I.; Wilson-Hodge, C.; Ak, Harding; Winer, B. L.; As, Johnson; Wood, K. S.; Wu, X. F.; B. Thayer, J.; Yamazaki, R.; Yang, Z.; Aj, Van Der Horst; Ylinen, T.; Ap, Waite; Ziegler, M.; A. Porter, T.

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American Astronomical Society, Astrophysical Journal, 2(729), p. 114, 2011

DOI: 10.1088/0004-637x/729/2/114

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

Journal article published in 2011 by M. G. Baring, Baring Mg, P. N. Bhat, M.; Ajello M.; /Stanford U. HEPL /KIPAC Menlo Park /SLAC /Stanford U. Phys Dept.;Asano K.; /RLNR Tokyo;Axelsson M.; /Stockholm U. /Lund Observ. /Stockholm U. OKC;Baldini L.; /INFN Pisa;Ballet J.; /AIM Saclay;Barbiellini G.; /INFN Trieste /Trieste U.;Baring Ackermann

, R. D. Blandford, Bhat Pn, Marco Ajello

, Blandford Rd, K. Asano, A. W. Borgland, M. S. Briggs, Magnus Axelsson, L. Baldini

, J. M. Casandjian, Caliandro Ga and other authors.

This paper is made freely available by the publisher.

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31 pages, 6 figures, accepted by ApJ for publication Contact Authors: Johan Bregeon (johan.bregeon@pi.infn.it), Adam Goldstein (adam.m.goldstein@nasa.gov), Rob Preece (Rob.Preece@nasa.gov), Hiromitsu Takahashi (hirotaka@hep01.hepl.hiroshima-u.ac.jp), Kenji Toma (toma@astro.psu.edu), Takeshi Uehara (uehara@hep01.hepl.hiroshima-u.ac.jp) ; 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.

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

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