MAGIC observation of the GRB080430 afterglow
MAGIC Collaboration: J. Aleksi\'c (1), H. Anderhub (2), L. A., Antonelli (3), P. Antoranz (4), M. Backes (5), C. Baixeras (6), S. Balestra, (4), J. A. Barrio (4), D. Bastieri (7), J. Becerra Gonz\'alez (8), J. K., Becker (5), W. Bednarek (9), A. Berdyugin (10), K. Berger (9)

TL;DR
This paper reports on MAGIC telescope observations of GRB 080430's afterglow at energies above 80 GeV, providing upper limits on very-high energy emission and demonstrating the potential for ground-based telescopes to detect GRB emissions at moderate redshifts.
Contribution
The study presents the first upper limit on very-high energy emission from GRB 080430 and assesses the capability of Cherenkov telescopes to detect GRB afterglows at moderate redshifts.
Findings
Upper limit of $5.5 imes 10^{-11}$ erg cm$^{-2}$ s$^{-1}$ for VHE emission
Cherenkov telescopes can detect GRB afterglows at $z \,\lesssim 0.8$ with early observations
No constraints on theoretical models due to modeling difficulties
Abstract
Context: Gamma-ray bursts are cosmological sources emitting radiation from the gamma-rays to the radio band. Substantial observational efforts have been devoted to the study of gamma-ray bursts during the prompt phase, i.e. the initial burst of high-energy radiation, and during the long-lasting afterglows. In spite of many successes in interpreting these phenomena, there are still several open key questions about the fundamental emission processes, their energetics and the environment. Aim: Independently of specific gamma-ray burst theoretical recipes, spectra in the GeV/TeV range are predicted to be remarkably simple, being satisfactorily modeled with power-laws, and therefore offer a very valuable tool to probe the extragalactic background light distribution. Furthermore, the simple detection of a component at very-high energies, i.e. at \,GeV, would solve the ambiguity…
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