Investigating the Nature of Late-time High-energy GRB Emission through Joint Fermi/Swift Observations

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Investigating the Nature of Late-time High-energy GRB Emission through Joint Fermi/Swift Observations

Ajello, M. (author): Clemson Univ, Kinard Lab Phys, Dept Phys & Astron, Clemson, SC 29634 USA.

Baldini, L. (author): Univ Pisa, I-56127 Pisa, Italy.;Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

Barbiellini, G. (author): Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy.;Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy.

Bastieri, D. (author): Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy.

Bellazzini, R. (author): Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

Bissaldi, E. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Blandford, R. D. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.;Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA.

Bonino, R. (author): Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy.;Univ Turin, Dipartimento Fis, I-10125 Turin, Italy.

Bottacini, E. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.;Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA.

Bregeon, J. (author): Univ Montpellier, CNRS IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier, France.

Bruel, P. (author): CNRS IN2P3, Ecole Polytech, Lab Leprince Ringuet, F-91128 Palaiseau, France.

Buehler, R. (author): DESY, D-15738 Zeuthen, Germany.

Cameron, R. A. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Caputo, R. (author): CRESST, Greenbelt, MD 20771 USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.

Caraveo, P. A. (author): INAF Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy.

Chiaro, G. (author): INAF Ist Astrofis Spaziale & Fis Cosm Milano, Via E Bassini 15, I-20133 Milan, Italy.

Ciprini, S. (author): Agenzia Spaziale Italiana, Space Sci Data Ctr, Via Politecn, I-00133 Rome, Italy.

Cohen-Tanugi, J. (author): Univ Montpellier, CNRS IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier, France.

Costantin, D. (author): Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy.

D'Ammando, F. (author): INAF Ist Radioastron, I-40129 Bologna, Italy.;Univ Bologna, Dipartimento Astron, I-40127 Bologna, Italy.

de Palma, F. (author): Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.;Univ Telemat Pegaso, Piazza Trieste & Trento 48, I-80132 Naples, Italy.

Di Lalla, N. (author): Univ Pisa, I-56127 Pisa, Italy.;Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

Di Mauro, M. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Di Venere, L. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Dominguez, A. (author): Univ Complutense Madrid, Grp Altas Energias, E-28040 Madrid, Spain.

Favuzzi, C. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Franckowiak, A. (author): DESY, D-15738 Zeuthen, Germany.

Fukazawa, Y. (author): Hiroshima Univ, Dept Phys Sci, Higashihiroshima, Hiroshima 7398526, Japan.

Funk, S. (author): Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany.

Fusco, P. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Gargano, F. (author): Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Gasparrini, D. (author): Agenzia Spaziale Italiana, Space Sci Data Ctr, Via Politecn, I-00133 Rome, Italy.;Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy.

Giglietto, N. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Giordano, F. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Giroletti, M. (author): INAF Ist Radioastron, I-40129 Bologna, Italy.

Green, D. (author): Univ Maryland, Dept Astron, College Pk, MD 20742 USA.;NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.

Grenier, I. A. (author): Univ Paris Diderot, Lab AIM, CEA IRFU, CNRS,Serv Astrophys,CEA Saclay, F-91191 Gif Sur Yvette, France.

Guiriec, S. (author): NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.;George Washington Univ, Dept Phys, 725 21st St NW, Washington, DC 20052 USA.

Holt, C. (author): Univ Maryland Baltimore Cty, Dept Phys, Baltimore, MD 21250 USA.;Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA.

Horan, D. (author): CNRS IN2P3, Ecole Polytech, Lab Leprince Ringuet, F-91128 Palaiseau, France.

Johannesson, G. (author): Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland.;NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden.

Kocevski, D. (author): NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.

Kuss, M. (author): Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

La Mura, G. (author): Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy.

Larsson, Stefan (author): KTH,Partikel- och astropartikelfysik

Li, J. (author): Inst Space Sci CSICIEEC, Campus UAB,Carrer Magrans S-N, E-08193 Barcelona, Spain.

Longo, F. (author): Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy.;Univ Trieste, Dipartimento Fis, I-34127 Trieste, Italy.

Loparco, F. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Lubrano, P. (author): Ist Nazl Fis Nucl, Sez Perugia, I-06123 Perugia, Italy.

Magill, J. D. (author): Univ Maryland, Dept Astron, College Pk, MD 20742 USA.

Maldera, S. (author): Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA.

Manfreda, A. (author): Univ Pisa, I-56127 Pisa, Italy.

Mazziotta, M. N. (author): Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Michelson, P. F. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Mizuno, T. (author): Hiroshima Univ, Hiroshima Astrophys Sci Ctr, Higashihiroshima, Hiroshima 7398526, Japan.

Monzani, M. E. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Morselli, A. (author): Ist Nazl Fis Nucl, Sez Roma Tor Vergata, I-00133 Rome, Italy.

Negro, M. (author): Ist Nazl Fis Nucl, Sez Torino, I-10125 Turin, Italy.;Univ Turin, Dipartimento Fis, I-10125 Turin, Italy.

Nuss, E. (author): Univ Montpellier, CNRS IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier, France.

Omodei, N. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Orienti, M. (author): INAF Ist Radioastron, I-40129 Bologna, Italy.

Orlando, E. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Paliya, V. S. (author): Clemson Univ, Kinard Lab Phys, Dept Phys & Astron, Clemson, SC 29634 USA.

Perkins, J. S. (author): NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.

Persic, M. (author): Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy.;Ist Nazl Astrofis, Osservatorio Astron Trieste, I-34143 Trieste, Italy.

Pesce-Rollins, M. (author): Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

Piron, F. (author): Univ Montpellier, CNRS IN2P3, Lab Univers & Particules Montpellier, F-34095 Montpellier, France.

Principe, G. (author): Friedrich Alexander Univ Erlangen Nurnberg, Erlangen Ctr Astroparticle Phys, Erwin Rommel Str 1, D-91058 Erlangen, Germany.

Racusin, J. L. (author): NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.

Raino, S. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Rando, R. (author): Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Univ Padua, Dipartimento Fis & Astron G Galilei, I-35131 Padua, Italy.

Razzano, M. (author): Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

Razzaque, S. (author): Univ Johannesburg, Dept Phys, POB 524, ZA-2006 Auckland Pk, South Africa.

Reimer, A. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.;Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria.;Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria.

Reimer, O. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.;Leopold Franzens Univ Innsbruck, Inst Astro & Teilchenphys, A-6020 Innsbruck, Austria.;Leopold Franzens Univ Innsbruck, Inst Theoret Phys, A-6020 Innsbruck, Austria.

Sgro, C. (author)

Siskind, E. J. (author): NYCB Real Time Comp Inc, Lattingtown, NY 11560 USA.

Spandre, G. (author): Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy.

Spinelli, P. (author): Univ Politecn Bari, Dipartimento Fis M Merlin, I-70126 Bari, Italy.;Ist Nazl Fis Nucl, Sez Bari, I-70126 Bari, Italy.

Tak, D. (author): Univ Maryland, Dept Astron, College Pk, MD 20742 USA.

Thayer, J. B. (author): Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Dept Phys, Stanford, CA 94305 USA.

Torres, D. F. (author): ICREA, E-08010 Barcelona, Spain.

Tosti, G. (author): Univ Perugia, Dipartimento Fis, I-06123 Perugia, Italy.

Valverde, J. (author): CNRS IN2P3, Ecole Polytech, Lab Leprince Ringuet, F-91128 Palaiseau, France.

Vogel, M. (author): Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA.

Wood, K. (author): Praxis Inc, Alexandria, VA 22303 USA.;Naval Res Lab, Washington, DC 20375 USA.

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Clemson Univ, Kinard Lab Phys, Dept Phys & Astron, Clemson, SC 29634 USA Univ Pisa, I-56127 Pisa, Italy.;Ist Nazl Fis Nucl, Sez Pisa, I-56127 Pisa, Italy. (creator_code:org_t)

2018-08-17
2018
English.
In: Astrophysical Journal. - : Institute of Physics Publishing (IOPP). - 0004-637X .- 1538-4357. ; 863:2

Related links:: https://doi.org/10.3...; show more...; https://urn.kb.se/re...; https://doi.org/10.3...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

We use joint observations by the Swift X-ray Telescope (XRT) and the Fermi Large Area Telescope (LAT) of gamma-ray burst (GRB) afterglows to investigate the nature of the long-lived high-energy emission observed by Fermi LAT. Joint broadband spectral modeling of XRT and LAT data reveals that LAT nondetections of bright X-ray afterglows are consistent with a cooling break in the inferred electron synchrotron spectrum below the LAT and/or XRT energy ranges. Such a break is sufficient to suppress the high-energy emission so as to be below the LAT detection threshold. By contrast, LAT-detected bursts are best fit by a synchrotron spectrum with a cooling break that lies either between or above the XRT and LAT energy ranges. We speculate that the primary difference between GRBs with LAT afterglow detections and the nondetected population may be in the type of circumstellar environment in which these bursts occur, with late-time LAT detections preferentially selecting GRBs that occur in low wind-like circumburst density profiles. Furthermore, we find no evidence of high-energy emission in the LAT-detected population significantly in excess of the flux expected from the electron synchrotron spectrum fit to the observed X-ray emission. The lack of excess emission at high energies could be due to a shocked external medium in which the energy density in the magnetic field is stronger than or comparable to that of the relativistic electrons behind the shock, precluding the production of a dominant synchrotron self-Compton (SSC) component in the LAT energy range. Alternatively, the peak of the SSC emission could be beyond the 0.1-100 GeV energy range considered for this analysis.

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By the author/editor: Ajello, M.; Baldini, L.; Barbiellini, G.; Bastieri, D.; Bellazzini, R.; Bissaldi, E.; show more...; Blandford, R. D.; Bonino, R.; Bottacini, E.; Bregeon, J.; Bruel, P.; Buehler, R.; Cameron, R. A.; Caputo, R.; Caraveo, P. A.; Chiaro, G.; Ciprini, S.; Cohen-Tanugi, J.; Costantin, D.; D'Ammando, F.; de Palma, F.; Di Lalla, N.; Di Mauro, M.; Di Venere, L.; Dominguez, A.; Favuzzi, C.; Franckowiak, A.; Fukazawa, Y.; Funk, S.; Fusco, P.; Gargano, F.; Gasparrini, D.; Giglietto, N.; Giordano, F.; Giroletti, M.; Green, D.; Grenier, I. A.; Guiriec, S.; Holt, C.; Horan, D.; Johannesson, G.; Kocevski, D.; Kuss, M.; La Mura, G.; Larsson, Stefan; Li, J.; Longo, F.; Loparco, F.; Lubrano, P.; Magill, J. D.; Maldera, S.; Manfreda, A.; Mazziotta, M. N.; Michelson, P. F.; Mizuno, T.; Monzani, M. E.; Morselli, A.; Negro, M.; Nuss, E.; Omodei, N.; Orienti, M.; Orlando, E.; Paliya, V. S.; Perkins, J. S.; Persic, M.; Pesce-Rollins, M ...; Piron, F.; Principe, G.; Racusin, J. L.; Raino, S.; Rando, R.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Sgro, C.; Siskind, E. J.; Spandre, G.; Spinelli, P.; Tak, D.; Thayer, J. B.; Torres, D. F.; Tosti, G.; Valverde, J.; Vogel, M.; Wood, K.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Articles in the publication: Astrophysical Jo ...

By the university: Royal Institute of Technology

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Investigating the Nature of Late-time High-energy GRB Emission through Joint Fermi/Swift Observations

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