NuSTAR observations of GRB 130427A establish a single component synchrotron afterglow origin for the late optical to multi-gev emission

C. Kouveliotou, J. Granot, J. L. Racusin, E. Bellm, G. Vianello, S. Oates, C. L. Fryer, S. E. Boggs, F. E. Christensen, W. W. Craig, C. D. Dermer, N. Gehrels, C. J. Hailey, F. A. Harrison, A. Melandri, J. E. McEnery, C. G. Mundell, D. K. Stern, G. Tagliaferri, W. W. Zhang

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

GRB 130427A occurred in a relatively nearby galaxy; its prompt emission had the largest GRB fluence ever recorded. The afterglow of GRB 130427A was bright enough for the Nuclear Spectroscopic Telescope ARray (NuSTAR) to observe it in the 3-79 keV energy range long after its prompt emission (∼1.5 and 5 days). This range, where afterglow observations were previously not possible, bridges an important spectral gap. Combined with Swift, Fermi, and ground-based optical data, NuSTAR observations unambiguously establish a single afterglow spectral component from optical to multi-GeV energies a day after the event, which is almost certainly synchrotron radiation. Such an origin of the late-time Fermi/Large Area Telescope >10 GeV photons requires revisions in our understanding of collisionless relativistic shock physics.

Original languageEnglish
Article numberL1
JournalAstrophysical Journal Letters
Volume779
Issue number1
DOIs
Publication statusPublished - 10 Dec 2013

Keywords

  • acceleration of particles
  • gamma-ray burst: individual (GRB 130427A)
  • magnetic fields
  • radiation mechanisms: non-thermal
  • shock waves

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of '<i>NuSTAR</i> observations of GRB 130427A establish a single component synchrotron afterglow origin for the late optical to multi-gev emission'. Together they form a unique fingerprint.

  • Cite this

    Kouveliotou, C., Granot, J., Racusin, J. L., Bellm, E., Vianello, G., Oates, S., Fryer, C. L., Boggs, S. E., Christensen, F. E., Craig, W. W., Dermer, C. D., Gehrels, N., Hailey, C. J., Harrison, F. A., Melandri, A., McEnery, J. E., Mundell, C. G., Stern, D. K., Tagliaferri, G., & Zhang, W. W. (2013). NuSTAR observations of GRB 130427A establish a single component synchrotron afterglow origin for the late optical to multi-gev emission. Astrophysical Journal Letters, 779(1), [L1]. https://doi.org/10.1088/2041-8205/779/1/L1