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Bright gamma-ray flares observed in GRB131108A

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Zhu,  S.
Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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引用

Ajello, M., Arimoto, M., Asano, K., Axelsson, M., Baldini, L., Barbiellini, G., Bastieri, D., Bellazzini, R., Berretta, A., Bissaldi, E., Blandford, R. D., Bonino, R., Bottacini, E., Bregeon, J., Bruel, P., Buehler, R., Buson, S., Cameron, R. A., Caputo, R., Caraveo, P. A., Cavazzuti, E., Chen, S., Chiaro, G., Ciprini, S., Costantin, D., Cutini, S., D'Ammando, F., Luque, P. d. l. T., de Palma, F., Di Lalla, N., Di Venere, L., Dirirsa, F. F., Fegan, S. J., Franckowiak, A., Fukazawa, Y., Fusco, P., Gargano, F., Gasparrini, D., Giglietto, N., Giordano, F., Giroletti, M., Green, D., Grenier, I. A., Grondin, M.-.-H., Guiriec, S., Hays, E., Horan, D., 'ohannesson, G. J., Kocevski, D., Kovac'evic', M., Kuss, M., Larsson, S., Latronico, L., Li, J., Liodakis, I., Longo, F., Loparco, F., Lovellette, M. N., Lubrano, P., Maldera, S., Manfreda, A., 'i-Devesa, G. M., Mazziotta, M. N., McEnery, J. E., Mereu, I., Michelson, P. F., Mizuno, T., Monzani, M. E., Moretti, E., Morselli, A., Moskalenko, I. V., Negro, M., Nuss, E., Ohno, M., Omodei, N., Orienti, M., Orlando, E., Palatiello, M., Paliya, V. S., Paneque, D., Pei, Z., Persic, M., Pesce-Rollins, M., Petrosian, V., Piron, F., Poon, H., Porter, T. A., Principe, G., Racusin, J. L., Raino, S., Rando, R., Rani, B., Razzano, M., Reimer, A., Reimer, O., Serini, D., Sgro, C., Siskind, E. J., Spandre, G., Spinelli, P., Tajima, H., Takagi, K., Tak, D., Torres, D. F., Valverde, J., Wood, K., Yamazaki, R., Yassine, M., Zhu, S., Uhm, Z. L., & Zhang, B. (2019). Bright gamma-ray flares observed in GRB131108A. The Astrophysical Journal Letters, 886(2):. doi:10.3847/2041-8213/ab564f.


引用: https://hdl.handle.net/21.11116/0000-0005-7292-5
要旨
GRB 131108A is a bright long Gamma-Ray Burst (GRB) detected by the Large Area
Telescope and the Gamma-ray Burst Monitor on board the \textit{Fermi Gamma-ray
Space Telescope}. Dedicated temporal and spectral analyses reveal three
$\gamma$-ray flares dominating above 100 MeV, which are not directly related to
the prompt emission in the GBM band (10 keV--10 MeV). The high-energy light
curve of GRB 131108A (100 MeV -- 10 GeV) shows an unusual evolution: a steep
decay, followed by three flares with an underlying emission, and then a
long-lasting decay phase. The detailed analysis of the $\gamma$-ray flares
finds that the three flares are 6 -- 20 times brighter than the underlying
emission and are similar to each other. The fluence of each flare, (1.6 $\sim$
2.0) $\times$ 10$^{-6}$ erg cm$^{-2}$, is comparable to that of emission during
the steep decay phase, 1.7 $\times$ 10$^{-6}$ erg cm$^{-2}$. The total fluence
from three $\gamma$-ray flares is 5.3 $\times$ 10$^{-6}$ erg cm$^{-2}$. The
three $\gamma$-ray flares show properties similar to the usual X-ray flares
that are sharp flux increases, occurring in $\sim$ 50\% of afterglows, in some
cases well after the prompt emission. Also, the temporal and spectral indices
during the early steep decay phase and the decaying phase of each flare show
the consistency with a relation of the curvature effect ($\hat{\alpha}$ = 2 +
$\hat{\beta}$), which is the first observational evidence of the high-latitude
emission in the GeV energy band.