GRB110721A: An extreme peak energy and signatures of the photosphere

Axelsson, M.; Baldini, L.; Barbiellini, G.; Baring, M. G.; Bellazzini, R.; Bregeon, J.; Brigida, M.; Bruel, P.; Buehler, R.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Cecchi, C.; Chaves, R. C.  G.; Chekhtman, A.; Chiang, J.; Claus, R.; Conrad, J.; Cutini, S.; D'Ammando, F.; de Palma, F.; Dermer, C. D.; do Couto e Silva, E.; Drell, P. S.; Favuzzi, C.; Fegan, S. J.; Ferrara, E. C.; Focke, W. B.; Fukazawa, Y.; Fusco, P.; Gargano, F.; Gasparrini, D.; Gehrels, N.; Germani, S.; Giglietto, N.; Giroletti, M.; Godfrey, G.; Guiriec, S.; Hadasch, D.; Hanabata, Y.; Hayashida, M.; Hou, X.; Iyyani, S.; Jackson, M. S.; Kocevski, D.; Kuss, M.; Larsson, J.; Larsson, S.; Longo, F.; Loparco, F.; Lundman, C.; Mazziotta, M. N.; McEnery, J. E.; Mizuno, T.; Monzani, M. E.; Moretti, E.; Morselli, A.; Murgia, S.; Nuss, E.; Nymark, T.; Ohno, M.; Omodei, N.; Pesce-Rollins, M.; Piron, F.; Pivato, G.; Racusin, J. L.; Rainò, S.; Razzano, M.; Razzaque, S.; Reimer, A.; Roth, M.; Ryde, F.; Sanchez, D. A.; Sgrò, C.; Siskind, E. J.; Spandre, G.; Spinelli, P.; Stamatikos, M.; Tibaldo, L.; Tinivella, M.; Usher, T. L.; Vandenbroucke, J.; Vasileiou, V.; Vianello, G.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Burgess, J. M.; Bhat, P. N.; Bissaldi, E.; Briggs, M. S.; Connaughton, V.; Fishman, G.; Fitzpatrick, G.; Foley, S.; Gruber, D.; Kippen, R. M.; Kouveliotou, C.; Jenke, P.; McBreen, S.; McGlynn, S.; Meegan, C.; Paciesas, W. S.; Pelassa, V.; Preece, R.; Tierney, D.; von Kienlin, A.; Wilson-Hodge, C.; Xiong, S.; Pe'er, A.

doi:10.1088/2041-8205/757/2/L31

Title: GRB110721A: An extreme peak energy and signatures of the photosphere

Journal Article · Mon Sep 17 00:00:00 EDT 2012 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.1088/2041-8205/757/2/L31· OSTI ID:1356670

Axelsson, M.; Baldini, L.; Barbiellini, G.; Baring, M. G.; Bellazzini, R.; Bregeon, J.; Brigida, M.; Bruel, P.; Buehler, R.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Cecchi, C.; Chaves, R. C. G.; Chekhtman, A.; Chiang, J.; Claus, R.; Conrad, J.; Cutini, S.; D'Ammando, F. more »

GRB110721A was observed by the Fermi Gamma-ray Space Telescope using its two instruments, the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM). This burst consisted of one major emission episode which lasted for ~24.5 s (in the GBM) and had a peak flux of (5.7 ± 0.2) × 10^–5 erg s^–1 cm^–2. The time-resolved emission spectrum is best modeled with a combination of a Band function and a blackbody spectrum. The peak energy of the Band component was initially 15 ± 2 MeV, which is the highest value ever detected in a GRB. We made this measurement by combining GBM/BGO data with LAT Low Energy events to achieve continuous 10-100 MeV coverage. The peak energy later decreased as a power law in time with an index of –1.89 ± 0.10. The temperature of the blackbody component also decreased, starting from ~80 keV, and the decay showed a significant break after ~2 s. The spectrum provides strong constraints on the standard synchrotron model, indicating that alternative mechanisms may give rise to the emission at these energies.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356670

Journal Information:: The Astrophysical Journal. Letters, Vol. 757, Issue 2; ISSN 2041-8205

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 142 works

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Modeling the high-energy emission in GRB 110721A and implications on the early multiwavelength and polarimetric observations Fraija, N.; Lee, W. H.; Araya, M. arXiv https://doi.org/10.48550/arxiv.1709.06263	text	January 2017
The X-shooter GRB afterglow legacy sample (XS-GRB) Selsing, J.; Malesani, D.; Goldoni, P. arXiv https://doi.org/10.48550/arxiv.1802.07727	text	January 2018
Multi-color blackbody emission in GRB 081221 Hou, Shu-Jin; Zhang, Bin-Bin; Meng, Yan-Zhi arXiv https://doi.org/10.48550/arxiv.1808.03942	text	January 2018
MultiPulse {\it Fermi} Gamma-Ray Bursts. I. Evidence of the Transition from Fireball to Poynting-flux-dominated Outflow Li, Liang arXiv https://doi.org/10.48550/arxiv.1810.03129	text	January 2018
Inverse Compton Scattering Spectra of Gamma-Ray Burst Prompt Emission Zhang, Yue; Geng, Jin-Jun; Huang, Yong-Feng arXiv https://doi.org/10.48550/arxiv.1901.05268	text	January 2019
Prompt optical emission as a signature of synchrotron radiation in gamma-ray bursts Oganesyan, Gor; Nava, Lara; Ghirlanda, Giancarlo arXiv https://doi.org/10.48550/arxiv.1904.11086	text	January 2019
Thermal Components in Gamma-ray Bursts. I. How Do They Affect Non-Thermal Spectral Parameters? Li, Liang arXiv https://doi.org/10.48550/arxiv.1905.02340	text	January 2019
Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-Energy Emission from Prompt to Afterglow Ajello, M.; Arimoto, M.; Axelsson, M. arXiv https://doi.org/10.48550/arxiv.1909.10605	text	January 2019
Spectral analysis of Fermi-LAT gamma-ray bursts with known redshift and their potential use as cosmological standard candles Dirirsa, F. Fana; Razzaque, S.; Piron, F. arXiv https://doi.org/10.48550/arxiv.1910.07009	text	January 2019

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