The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations

Details The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations The upstream magnetic field of collisionless GRB shocks: constraint by Fermi-LAT observations

Publishing date

2010-04-06

URL

arxiv.org/abs/1004.0791v3

Journals

JCAP05(2011)008

Science

Astronomy and Astrophysics

Field

Astrophysics

SubField

High Energy Astrophysical Phenomena

Additional info

9 pages, JCAP accepted

Type

Scientific paper

Digital Object Identifier

10.1088/1475-7516/2011/05/008

Abstract

Long-lived >100 MeV emission has been a common feature of most Fermi-LAT detected gamma-ray bursts (GRBs), e.g., detected up to ~10^3s in long GRBs 080916C and 090902B and ~10^2s in short GRB 090510. This emission is consistent with being produced by synchrotron emission of electrons accelerated to high energy by the relativistic collisionless shock propagating into the weakly magnetized medium. Here we show that this high-energy afterglow emission constrains the preshock magnetic field to satisfy 1(n/1cc)^{9/8} mG

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