Extreme value distribution for gamma-ray-burst prompt data - How unexpected was the BOAT event?

Open Access

Table B.1

GEV fitted parameters and uncertainties

Fluence	CGRO-BATSE	Fermi-GBM	Fermi-GBM
			(without the BOAT)
Μ	–4.73 ± 0.04	–4.41 ± 0.03	–4.40 ± 0.03
log ϕ	$- {0.53}_{- 0.04}^{+ 0.05}$ $- 0.53_{ - 0.04}^{ + 0.05}$	–0.40 ± 0.02	–0.40 ± 0.02
Ξ	–0.12 ± 0.09	–0.04 ± 0.03	–0.12 ± 0.03

Peak flux	CGRO-BATSE	Fermi-GBM	Fermi-GBM
			(without the BOAT)
Μ	0.91 ± 0.05	${1.46}_{- 0.02}^{+ 0.03}$ $1.46_{ - 0.02}^{ + 0.03}$	1.47 ± 0.03
log ϕ	$- {0.44}_{- 0.04}^{+ 0.05}$ $- 0.44_{ - 0.04}^{ + 0.05}$	–0.47 ± 0.02	–0.47 ± 0.02
Ξ	–0.37 ± 0.10	${0.00}_{- 0.04}^{+ 0.05}$ $0.00_{ - 0.04}^{ + 0.05}$	–0.07 ± 0.05

Duration	CGRO-BATSE	Fermi-GBM	Fermi-GBM
			(without the BOAT)
Μ	2.12 ± 0.03	2.10 ± 0.02
log ϕ	–0.63 ± 0.04	$- {0.65}_{- 0.02}^{+ 0.03}$ $- 0.65_{ - 0.02}^{ + 0.03}$
ξ	$- {0.20}_{- 0.07}^{+ 0.08}$ $- 0.20_{ - 0.07}^{ + 0.08}$	–0.14 ± 0.04

Notes. The 1σ interval and the average of the fitted parameters of the derived GEV distributions. We report results for the extreme values computed from the CGRO-BATSE catalogue and from the full Fermi-GBM catalogue. For comparison, we also show results obtained having removed GRB 221009A from the catalogue for the fluence and peak flux.

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