PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Gamma-ray Astronomy (GA)
Search for pair echo signatures in the gamma-ray light curve of GRB190114C
I. Vovk
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Pre-published on: July 25, 2023
Published on:
The time delayed electromagnetic cascade "echo" model is applied to the gamma-ray burst GRB190114C, the first one observed simultaneously in high- and very high-energy gamma-ray bands. It is shown that even without intervening magnetic fields, the intrinsic cascade spread stretches the "echo" emission over a time span of $10^3-10^5$ seconds, depending on the energy. Considering the measured source flux in the $0.3-1$ TeV gamma-ray range, the predicted "echo" flux matches the lower-energy gamma-ray emission detected $10^4$ seconds after the burst. However, within the measurement uncertainties, the "echo" emission remain indistinguishable from the intrinsic gamma-ray burst flux. Implications of these findings for intergalactic magnetic fields measurements with GRB190114C are discussed.
DOI: https://doi.org/10.22323/1.444.0712
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