期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 779, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/779/1/L1
关键词
acceleration of particles; gamma-ray burst: individual (GRB 130427A); magnetic fields; radiation mechanisms: non-thermal; shock waves
资金
- NASA [NNG08FD60C]
- INAF in Italy
- CNES in France for science
- STFC [ST/J001465/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001465/1] Funding Source: researchfish
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 (similar to 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.
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