An active state of the BL Lacertae object Markarian 421 detected by INTEGRAL in April 2013

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Volume 570 (October 2014)

A&A, 570 (2014) A77

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Table 2

Statistical parameters of Fermi-LAT fluxes and spectral indices correlation.

Test		ν _{12 h}	P _{12 h} ^a		ν _{24 h}	P_{24 h}^a

Constant photon index	9.93 (4.37)^b	10 (9)	0.50 (0.89)	6.16	6	0.47
Constant flux	17.3 (13.0)	10 (9)	0.065 (0.18)	21.9	6	< 10^-4
Weighted least squares linear fit	7.0 (7.0)	9 (8)	0.68 (0.59)	4.50	5	0.54
Weighted correlation coefficient	0.77 (0.68)	9 (8)	0.0055 (0.03)	0.89	5	0.0072

Notes. The sub-index in the χ² value, degrees of freedom ν and probability P indicates the time binning of the data: 12 or 24 h.

^(a)

This indicates the probability of the null hypothesis for the tests of constancy and linear. trend and of chance correlation for the correlation coefficient.

^(b)

The quantities in parentheses for the 12 h binning parameters refer to the case where the point of steepest spectrum and highest flux was removed.

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