Detection of high-energy gamma-ray emission during the X-ray flaring activity in GRB 100728A

A. A. Abdo, M. Ackermann, M. Ajello, L. Baldini, J. Ballet, G. Barbiellini, M. G. Baring, D. Bastieri, K. Bechtol, R. Bellazzini, B. Berenji, P. N. Bhat, E. Bissaldi, R. D. Blandford, E. Bonamente, J. Bonnell, A. W. Borgland, A. Bouvier, J. Bregeon, M. BrigidaP. Bruel, R. Buehler, S. Buson, G. A. Caliandro, R. A. Cameron, P. A. Caraveo, J. M. Casandjian, C. Cecchi, E. Charles, A. Chekhtman, J. Chiang, S. Ciprini, R. Claus, V. Connaughton, J. Conrad, S. Cutini, A. De Angelis, F. De Palma, C. D. Dermer, E. Do Couto E Silva, P. S. Drell, R. Dubois, C. Favuzzi, Y. Fukazawa, P. Fusco, F. Gargano, N. Gehrels, S. Germani, N. Giglietto, P. Giommi, F. Giordano, M. Giroletti, T. Glanzman, G. Godfrey, J. Granot, I. A. Grenier, S. Guiriec, D. Hadasch, Y. Hanabata, R. E. Hughes, G. Jóhannesson, A. S. Johnson, T. Kamae, H. Katagiri, J. Kataoka, M. Kerr, J. Knödlseder, M. Kuss, J. Lande, L. Latronico, S. H. Lee, F. Longo, F. Loparco, B. Lott, P. Lubrano, M. N. Mazziotta, J. E. McEnery, P. Mészros, P. F. Michelson, T. Mizuno, A. A. Moiseev, M. E. Monzani, A. Morselli, I. V. Moskalenko, S. Murgia, T. Nakamori, M. Naumann-Godo, P. L. Nolan, J. P. Norris, E. Nuss, T. Ohsugi, A. Okumura, N. Omodei, E. Orlando, W. S. Paciesas, V. Pelassa, M. Pesce-Rollins, M. Pierbattista, F. Piron, T. A. Porter, J. L. Racusin, S. Rainò, M. Razzano, S. Razzaque, A. Reimer, O. Reimer, L. C. Reyes, M. Roth, H. F.W. Sadrozinski, C. Sgrò, E. J. Siskind, P. D. Smith, E. Sonbas, G. Spandre, P. Spinelli, M. Stamatikos, M. S. Strickman, H. Takahashi, T. Tanaka, Y. Tanaka, J. G. Thayer, J. B. Thayer, D. F. Torres, G. Tosti, E. Troja, T. Uehara, T. L. Usher, J. Vandenbroucke, V. Vasileiou, G. Vianello, N. Vilchez, V. Vitale, A. Von Kienlin, A. P. Waite, P. Wang, B. L. Winer, K. S. Wood, R. Yamazaki, Z. Yang, M. Ziegler, L. Piro

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36 Scopus citations

Abstract

We present the simultaneous Swift and Fermi observations of the bright GRB 100728A and its afterglow. The early X-ray emission is dominated by a vigorous flaring activity continuing until 1ks after the burst. In the same time interval, high-energy emission is significantly detected by the Fermi/Large Area Telescope. Marginal evidence ofGeV emission is observed up to later times. We discuss the broadband properties of this burst within both the internal and external shock scenarios, with a particular emphasis on the relation between X-ray flares, theGeV emission, and a continued long-duration central engine activity as their power source.

Original languageEnglish (US)
Article numberL27
JournalAstrophysical Journal Letters
Volume734
Issue number2 PART 2
DOIs
StatePublished - Jun 20 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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