Table 1: The UHECR (>10¹⁰ GeV) fraction generated by relativistic Fermi acceleration in the Monte-Carlo simulation. A number of 50 layers is considered here and the flow duration varies from 0.5 s (short GRB) to 10.0 s (long GRB). The magnetic field decreases as r^-3/2.
Flow duration (in s) Magnetic field at $r_{\rm b}$

10⁴ G 10⁵ G 10⁶ G

0.5 $5.4\times 10^{-5}$ $1.5\times 10^{-4}$ $3.6\times 10^{-4}$

1.0 $6.3\times 10^{-5}$ $1.9\times 10^{-4}$ $4.1\times 10^{-4}$

5.0 $5.1\times 10^{-5}$ $1.8\times 10^{-4}$ $4.8\times 10^{-4}$

10.0 $2.0\times 10^{-5}$ $1.2\times 10^{-4}$ $3.2\times 10^{-4}$

**Table 1:** The UHECR (>10¹⁰ GeV) fraction generated by relativistic Fermi acceleration in the Monte-Carlo simulation. A number of 50 layers is considered here and the flow duration varies from 0.5 s (short GRB) to 10.0 s (long GRB). The magnetic field decreases as r^-3/2.
Flow duration (in s)	Magnetic field at $r_{\rm b}$
	10⁴ G	10⁵ G	10⁶ G
0.5	$5.4\times 10^{-5}$	$1.5\times 10^{-4}$	$3.6\times 10^{-4}$
1.0	$6.3\times 10^{-5}$	$1.9\times 10^{-4}$	$4.1\times 10^{-4}$
5.0	$5.1\times 10^{-5}$	$1.8\times 10^{-4}$	$4.8\times 10^{-4}$
10.0	$2.0\times 10^{-5}$	$1.2\times 10^{-4}$	$3.2\times 10^{-4}$

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