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, Knoedlseder J, Kocevski D, Kouveliotou C, Kuss MW, 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 HH, 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 (2011)
Publication Type: Journal article
Publication year: 2011
Book Volume: 729
Journal Issue: 2
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.
APA:
Ackermann, M., Ajello, M., Asano, K., Axelsson, M., Baldini, L., Ballet, J.,... Ziegler, M. (2011). DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A. Astrophysical Journal, 729(2). https://doi.org/10.1088/0004-637X/729/2/114
MLA:
Ackermann, Markus, et al. "DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A." Astrophysical Journal 729.2 (2011).
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