Fermi Large Area Telescope observations of the fast-dimming Crab Nebula in 60–600 MeV

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Volume 638 (June 2020)

A&A, 638 (2020) A147

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Table 3.

Information about seven episodes of continuous low-flux.

Start time	Duration ^(a)	F_low^(b)	t_1/2^(c)	t₂^(d)
(MJD)	(days)	(10⁻⁶ cm⁻² s⁻¹)	(days)	(days)
55507.7	35	0.70 ± 0.14	10.7	<5.3
55802.7	35	0.38 ± 0.11	<2.2	15.5
55892.7	20	0.24 ± 0.15	3.8	<3.3
57042.7	45	0.82 ± 0.12	17.7	<4.0
57187.7	30	0.50 ± 0.13	<12.6	7.5
57492.7	15	0.47 ± 0.22	6.2	<1.9
58122.7	25	0.50 ± 0.16	2.4	6.4

Notes.

^(a)

The start times and durations are determined from Bayesian block segmentations.

^(b)

The local average fluxes in 60 MeV–600 MeV within the durations. In view of a broad variety of uncertainties, we adopt the unweighted means (instead of the error-weighted means plotted in Fig. 5) for unbiased calculations.

^(c)

Halving times of the exponential decay term. The upper limits are at a 95% confidence level.

^(d)

Doubling times of the exponential growth term. The upper limits are at a 95% confidence level.

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