Effects of Cosmic Infrared Background on High Energy Delayed Gamma-Rays from Gamma-Ray Bursts

Abstract

Regenerated high-energy emissions from gamma-ray bursts (GRBs) are studied in detail. If the intrinsic primary spectrum extends to the TeV range, these very high-energy photons are absorbed by the cosmic infrared background (CIB). Created high-energy electron-positron pairs up-scatter mainly cosmic microwave background (CMB) photons, and secondary photons are generated in the GeV-TeV range. These secondary delayed photons may be observed in the near future, which are useful for a consistency check of the intrinsic primary spectrum. In this paper, we focus on effects of the CIB on delayed secondary emissions. In particular, we show that not only up-scattered CMB photons but also up-scattered CIB ones are important, especially for low redshift bursts. They also give us additional information on the CIB, whose photon density is not definitely determined so far.

10 pages, 14 figures, accepted for publication in ApJ

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