Constraints on Very High Energy Emission from GRB 130427A
Oct 10, 2014
6 pages
Published in:
- Astrophys.J.Lett. 795 (2014) 1, L3
- Published: Oct 10, 2014
e-Print:
- 1410.5367 [astro-ph.HE]
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Abstract: (IOP)
Prompt emission from the very fluent and nearby (z = 0.34) gamma-ray burst GRB 130427A was detected by several orbiting telescopes and by ground-based, wide-field-of-view optical transient monitors. Apart from the intensity and proximity of this GRB, it is exceptional due to the extremely long-lived high-energy (100 MeV to 100 GeV) gamma-ray emission, which was detected by the Large Area Telescope on the Fermi Gamma-Ray Space Telescope for ~70 ks after the initial burst. The persistent, hard-spectrum, high-energy emission suggests that the highest-energy gamma rays may have been produced via synchrotron self-Compton processes though there is also evidence that the high-energy emission may instead be an extension of the synchrotron spectrum. VERITAS, a ground-based imaging atmospheric Cherenkov telescope array, began follow-up observations of GRB 130427A ~71 ks (~20 hr) after the onset of the burst. The GRB was not detected with VERITAS, however, the high elevation of the observations, coupled with the low redshift of the GRB, make VERITAS a very sensitive probe of the emission from GRB 130427A for E > 100 GeV. The non-detection and consequent upper limit derived place constraints on the synchrotron self-Compton model of high-energy gamma-ray emission from this burst.Note:
- 22 pages, 4 figures, 1 table
- gamma-ray burst: individual
- gamma ray: burst
- redshift
- synchrotron
- spectrum
- gamma ray: VHE
- GLAST
- cross section
- VERITAS
- gamma ray: emission
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