Can we constrain the extragalactic magnetic field from very high energy observations of GRB 190114C?

T. A. Dzhatdoev, E. I. Podlesnyi, and I. A. Vaiman
Phys. Rev. D 102, 123017 – Published 15 December 2020

Abstract

Primary very high energy γ rays from γ-ray bursts (GRBs) are partially absorbed on extragalactic background light photons with subsequent formation of intergalactic electromagnetic cascades. Characteristics of the observable cascade γ-ray signal are sensitive to the strength and structure of the extragalactic magnetic field (EGMF). GRB 190114C was recently detected with the MAGIC imaging atmospheric Cherenkov telescopes, for the first time allowing us to estimate the observable cascade intensity. We inquire whether any constraints on the EGMF strength and structure could be obtained from publicly available γ-ray data on GRB 190114C. We present detailed calculations of the observable cascade signal for various EGMF configurations. We show that the sensitivity of the Fermi-LAT space γ-ray telescope is not sufficient to obtain such constraints on the EGMF parameters. However, next-generation space γ-ray observatories such as MAST would be able to detect pair echoes from GRBs similar to GRB 190114C for the EGMF strength below 10171018G.

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  • Received 5 April 2020
  • Accepted 13 November 2020

DOI:https://doi.org/10.1103/PhysRevD.102.123017

© 2020 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Gravitation, Cosmology & Astrophysics

Authors & Affiliations

T. A. Dzhatdoev*

  • Federal State Budget Educational Institution of Higher Education, M.V. Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU), 1(2), Leninskie gory, GSP-1, 119991 Moscow, Russia and Institute for Cosmic Ray Research, University of Tokyo, 5-1-5 Kashiwanoha, 277-8582 Kashiwa, Japan

E. I. Podlesnyi and I. A. Vaiman

  • Federal State Budget Educational Institution of Higher Education, M.V. Lomonosov Moscow State University, Department of Physics, 1(2), Leninskie gory, GSP-1, 119991 Moscow, Russia and Federal State Budget Educational Institution of Higher Education, M.V. Lomonosov Moscow State University, Skobeltsyn Institute of Nuclear Physics (SINP MSU), 1(2), Leninskie gory, GSP-1, 119991 Moscow, Russia

  • *timur1606@gmail.com
  • podlesnyi.ei14@physics.msu.ru
  • gosha.vaiman@gmail.com

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Issue

Vol. 102, Iss. 12 — 15 December 2020

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