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  Bright gamma-ray flares observed in GRB131108A

Ajello, M., Arimoto, M., Asano, K., Axelsson, M., Baldini, L., Barbiellini, G., et al. (2019). Bright gamma-ray flares observed in GRB131108A. The Astrophysical Journal Letters, 886(2): L33. doi:10.3847/2041-8213/ab564f.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-7292-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7293-4
Genre: Journal Article

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Ajello, M., Author
Arimoto, M., Author
Asano, K., Author
Axelsson, M., Author
Baldini, L., Author
Barbiellini, G., Author
Bastieri, D., Author
Bellazzini, R., Author
Berretta, A., Author
Bissaldi, E., Author
Blandford, R. D., Author
Bonino, R., Author
Bottacini, E., Author
Bregeon, J., Author
Bruel, P., Author
Buehler, R., Author
Buson, S., Author
Cameron, R. A., Author
Caputo, R., Author
Caraveo, P. A., Author
Cavazzuti, E., AuthorChen, S., AuthorChiaro, G., AuthorCiprini, S., AuthorCostantin, D., AuthorCutini, S., AuthorD'Ammando, F., AuthorLuque, P. de la Torre, Authorde Palma, F., AuthorDi Lalla, N., AuthorDi Venere, L., AuthorDirirsa, F. Fana, AuthorFegan, S. J., AuthorFranckowiak, A., AuthorFukazawa, Y., AuthorFusco, P., AuthorGargano, F., AuthorGasparrini, D., AuthorGiglietto, N., AuthorGiordano, F., AuthorGiroletti, M., AuthorGreen, D., AuthorGrenier, I. A., AuthorGrondin, M. -H., AuthorGuiriec, S., AuthorHays, E., AuthorHoran, D., Author'ohannesson, G. J, AuthorKocevski, D., AuthorKovac'evic', M., AuthorKuss, M., AuthorLarsson, S., AuthorLatronico, L., AuthorLi, J., AuthorLiodakis, I., AuthorLongo, F., AuthorLoparco, F., AuthorLovellette, M. N., AuthorLubrano, P., AuthorMaldera, S., AuthorManfreda, A., Author'i-Devesa, G. Mart, AuthorMazziotta, M. N., AuthorMcEnery, J. E., AuthorMereu, I., AuthorMichelson, P. F., AuthorMizuno, T., AuthorMonzani, M. E., AuthorMoretti, E., AuthorMorselli, A., AuthorMoskalenko, I. V., AuthorNegro, M., AuthorNuss, E., AuthorOhno, M., AuthorOmodei, N., AuthorOrienti, M., AuthorOrlando, E., AuthorPalatiello, M., AuthorPaliya, V. S., AuthorPaneque, D., AuthorPei, Z., AuthorPersic, M., AuthorPesce-Rollins, M., AuthorPetrosian, V., AuthorPiron, F., AuthorPoon, H., AuthorPorter, T. A., AuthorPrincipe, G., AuthorRacusin, J. L., AuthorRaino, S. , AuthorRando, R., AuthorRani, B., AuthorRazzano, M., AuthorReimer, A., AuthorReimer, O., AuthorSerini, D., AuthorSgro, C. , AuthorSiskind, E. J., AuthorSpandre, G., AuthorSpinelli, P., AuthorTajima, H., AuthorTakagi, K., AuthorTak, D., AuthorTorres, D. F., AuthorValverde, J., AuthorWood, K., AuthorYamazaki, R., AuthorYassine, M., AuthorZhu, S.1, Author              Uhm, Z. L., AuthorZhang, B., Author more..
Affiliations:
1Searching for Continuous Gravitational Waves, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_2630691              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: 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.

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 Dates: 2019-11-112019
 Publication Status: Published in print
 Pages: accepted to ApJL, 10 pages, 3 figures, 2 tables
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1911.04642
DOI: 10.3847/2041-8213/ab564f
URI: http://arxiv.org/abs/1911.04642
 Degree: -

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Title: The Astrophysical Journal Letters
Source Genre: Journal
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Pages: - Volume / Issue: 886 (2) Sequence Number: L33 Start / End Page: - Identifier: -