Constraints on very high energy emission from GRB130427A

Aliu, E. and Aune, T. and Barnacka, A. and Beilicke, M. and Benbow, W. and Berger, K. and Biteau, J. and Buckley, J. H. and Bugaev, V. and Byrum, K. and Cardenzana, J. V. and Cerruti, M. and Chen, X. and Ciupik, L. and Connaughton, V. and Cui, W. and Dickinson, H. J. and Eisch, J. D. and Errando, M. and Falcone, A. and Federici, S. and Feng, Q. and Finley, J. P. and Fleischhack, H. and Fortin, P. and Fortson, L. and Furniss, A. and Galante, N. and Gillanders, G. H. and Griffin, S. and Veres, Péter (2014) Constraints on very high energy emission from GRB130427A. ASTROPHYSICAL JOURNAL LETTERS, 795 (1). ISSN 2041-8205

Preview

Text 1410.5367.pdf Available under License Creative Commons Attribution. Download (592kB) | Preview

Abstract

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 prox- imity 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 observa- tions 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 con- sequent upper limit derived place constraints on the synchrotron self-Compton model of high-energy gamma-ray emission from this burst.

Actions (login required)

Edit Item