DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A

Ackermann, M; Ajello, M; Asano, K; Axelsson, M; Baldini, Luca; Ballet, J; Barbiellini, G; Baring, Mg; Bastieri, D; Bechtol, K; Bellazzini, R; Berenji, B; Bhat, Pn; Bissaldi, E; Blandford, Rd; Bonamente, E; Borgland, Aw; Bouvier, A; Bregeon, J; Brez, A; Briggs, Ms; Brigida, M; Bruel, P; Buehler, R; Buson, S; Caliandro, Ga; Cameron, Ra; Caraveo, Pa; Carrigan, S; Casandjian, Jm; Cecchi, C; Celik, O; Chaplin, V; Charles, E; Chekhtman, A; Chiang, J; Ciprini, S; Claus, R; Cohen Tanugi, J; Connaughton, V; Conrad, J; Cutini, S; Dermer, Cd; De Angelis, A; De Palma, F; Dingus, Bl; Silva, Edce; Drell, Ps; Dubois, R; Favuzzi, C; Fegan, Sj; Ferrara, Ec; Focke, Wb; 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; Grenier, Ia; Grove, Je; Guiriec, S; Hadasch, D; Hanabata, Y; Harding, Ak; Hayashi, K; Hayashida, M; Hays, E; Horan, D; Hughes, Re; Itoh, R; Johannesson, G; Johnson, As; Johnson, Wn; Kamae, T; Katagiri, H; Kataoka, J; Kippen, Rm; Knodlseder, J; Kocevski, D; Kouveliotou, C; Kuss, M; Lande, J; Latronico, L; Lee, Sh; Garde, Ml; Longo, F; Loparco, F; Lovellette, Mn; Lubrano, P; Makeev, A; Mazziotta, Mn; McBreen, S; McEnery, Je; McGlynn, S; Meegan, C; Mehault, J; Meszaros, P; Michelson, Pf; Mizuno, T; Monte, C; Monzani, Me; Moretti, E; Morselli, A; Moskalenko, Iv; Murgia, S; Nakajima, H; Nakamori, T; Naumann Godo, M; Nishino, S; Nolan, Pl; Norris, Jp; Nuss, E; Ohno, M; Ohsugi, T; Okumura, A; Omodei, N; Orlando, E; Ormes, Jf; Ozaki, M; Paciesas, Ws; Paneque, D; Panetta, Jh; Parent, D; Pelassa, V; Pepe, M; Pesce Rollins, M; Petrosian, V; Piron, F; Porter, Ta; Preece, R; Racusin, Jl; Raino, S; Rando, R; Rau, A; Razzano, Massimiliano; Razzaque, S; Reimer, A; Reimer, O; Reposeur, T; Reyes, Lc; Ripken, J; Ritz, S; Roth, M; Ryde, F; Sadrozinski, Hfw; Sander, A; Scargle, Jd; Strickman, Ms; Suson, Dj; Tajima, H; Takahashi, H; Tanaka, T; Tanaka, Y; Thayer, Jb; Thayer, Jg; Tibaldo, L; Tierney, D; Toma, K; Torres, Df; Tosti, G; Tramacere, A; Uchiyama, Y; Uehara, T; Usher, Tl; Vandenbroucke, J; van der Horst AJ,; Vasileiou, V; Vilchez, N; Vitale, V; von Kienlin, A; Waite, Ap; Wang, P; Wilson Hodge, C; Winer, Bl; Wood, Ks; Wu, Xf; Yamazaki, R; Yang, Z; Ylinen, T; Ziegler, M.

doi:10.1088/0004-637X/729/2/114

We report on the observation of the bright, long gamma-ray burst, GRB 090926A, by the Gamma-ray Burst Monitor 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 gamma-ray bursts, 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.

Autori interni:	Ackermann M Ajello M Asano K Axelsson M BALDINI, LUCA Ballet J Barbiellini G Baring MG Bastieri D Bechtol K Bellazzini R Berenji B Bhat PN Bissaldi E Blandford RD Bonamente E Borgland AW Bouvier A Bregeon J Brez A Briggs MS Brigida M Bruel P Buehler R Buson S Caliandro GA Cameron RA Caraveo PA Carrigan S Casandjian JM Cecchi C Celik O Chaplin V Charles E Chekhtman A Chiang J Ciprini S Claus R Cohen Tanugi J Connaughton V Conrad J Cutini S Dermer CD De Angelis A De Palma F Dingus BL Silva EDCE Drell PS Dubois R Favuzzi C Fegan SJ Ferrara EC Focke WB 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 Grenier IA Grove JE Guiriec S Hadasch D Hanabata Y Harding AK Hayashi K Hayashida M Hays E Horan D Hughes RE Itoh R Johannesson G Johnson AS Johnson WN Kamae T Katagiri H Kataoka J Kippen RM Knodlseder J Kocevski D Kouveliotou C Kuss M Lande J Latronico L Lee SH Garde ML Longo F Loparco F Lovellette MN Lubrano P Makeev A Mazziotta MN McBreen S McEnery JE McGlynn S Meegan C Mehault J Meszaros P Michelson PF Mizuno T Monte C Monzani ME Moretti E Morselli A Moskalenko IV Murgia S Nakajima H Nakamori T Naumann Godo M Nishino S Nolan PL Norris JP Nuss E Ohno M Ohsugi T Okumura A Omodei N Orlando E Ormes JF Ozaki M Paciesas WS Paneque D Panetta JH Parent D Pelassa V Pepe M Pesce Rollins M Petrosian V Piron F Porter TA Preece R Racusin JL Raino S Rando R Rau A RAZZANO, MASSIMILIANO Razzaque S Reimer A Reimer O Reposeur T Reyes LC Ripken J Ritz S Roth M Ryde F Sadrozinski HFW Sander A Scargle JD Strickman MS Suson DJ Tajima H Takahashi H Tanaka T Tanaka Y Thayer JB Thayer JG Tibaldo L Tierney D Toma K Torres DF Tosti G Tramacere A Uchiyama Y Uehara T Usher TL Vandenbroucke J van der Horst AJ Vasileiou V Vilchez N Vitale V von Kienlin A Waite AP Wang P Wilson Hodge C Winer BL Wood KS Wu XF Yamazaki R Yang Z Ylinen T Ziegler M. mostra contributor esterni nascondi contributor esterni
Autori:	Ackermann M; Ajello M; Asano K; Axelsson M; Baldini L; Ballet J; Barbiellini G; Baring MG; Bastieri D; Bechtol K; Bellazzini R; Berenji B; Bhat PN; Bissaldi E; Blandford RD; Bonamente E; Borgland AW; Bouvier A; Bregeon J; Brez A; Briggs MS; Brigida M; Bruel P; Buehler R; Buson S; Caliandro GA; Cameron RA; Caraveo PA; Carrigan S; Casandjian JM; Cecchi C; Celik O; Chaplin V; Charles E; Chekhtman A; Chiang J; Ciprini S; Claus R; Cohen-Tanugi J; Connaughton V; Conrad J; Cutini S; Dermer CD; De Angelis A; De Palma F; Dingus BL; Silva EDCE; Drell PS; Dubois R; Favuzzi C; Fegan SJ; Ferrara EC; Focke WB; 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; Grenier IA; Grove JE; Guiriec S; Hadasch D; Hanabata Y; Harding AK; Hayashi K; Hayashida M; Hays E; Horan D; Hughes RE; Itoh R; Johannesson G; Johnson AS; Johnson WN; Kamae T; Katagiri H; Kataoka J; Kippen RM; Knodlseder J; Kocevski D; Kouveliotou C; Kuss M; Lande J; Latronico L; Lee SH; Garde ML; Longo F; Loparco F; Lovellette MN; Lubrano P; Makeev A; Mazziotta MN; McBreen S; McEnery JE; McGlynn S; Meegan C; Mehault J; Meszaros P; Michelson PF; Mizuno T; Monte C; Monzani ME; Moretti E; Morselli A; Moskalenko IV; Murgia S; Nakajima H; Nakamori T; Naumann-Godo M; Nishino S; Nolan PL; Norris JP; Nuss E; Ohno M; Ohsugi T; Okumura A; Omodei N; Orlando E; Ormes JF; Ozaki M; Paciesas WS; Paneque D; Panetta JH; Parent D; Pelassa V; Pepe M; Pesce-Rollins M; Petrosian V; Piron F; Porter TA; Preece R; Racusin JL; Raino S; Rando R; Rau A; Razzano M; Razzaque S; Reimer A; Reimer O; Reposeur T; Reyes LC; Ripken J; Ritz S; Roth M; Ryde F; Sadrozinski HFW; Sander A; Scargle JD; Strickman MS; Suson DJ; Tajima H; Takahashi H; Tanaka T; Tanaka Y; Thayer JB; Thayer JG; Tibaldo L; Tierney D; Toma K; Torres DF; Tosti G; Tramacere A; Uchiyama Y; Uehara T; Usher TL; Vandenbroucke J; van der Horst AJ; Vasileiou V; Vilchez N; Vitale V; von Kienlin A; Waite AP; Wang P; Wilson-Hodge C; Winer BL; Wood KS; Wu XF; Yamazaki R; Yang Z; Ylinen T; Ziegler M
Titolo:	DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A
Anno del prodotto:	2011
Digital Object Identifier (DOI):	10.1088/0004-637X/729/2/114
Appare nelle tipologie:	1.1 Articolo in rivista

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