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Table 1

Results from the IDV observations of quasar S4 0917+624 with the Urumqi 25 m telescope at 4.8 GHz.

1 2 3 4 5 6 7 8 9 10 11 12
Start day dur N S σ s m m 0 Y τ 0.5 P null m / m 0
[d] [Jy] [Jy] [%] [%] [%] [d]

2005 Aug 15 2.8 52 0.899 0.013 1.48 0.34 4.32 0.26 9.30 5.30E-70 4.4
2006 Apr. 28 3.9 71 1.069 0.014 1.33 0.45 3.76 0.24 2.18 4.45E-08 3.0
2006 Jun. 10 3.2 88 1.090 0.014 1.29 0.50 3.58 0.24 1.80 7.32E-06 2.6
2006 Jul. 14 4.0 94 1.083 0.014 1.29 0.60 3.42 1.51 1.11E-03 2.2
2006 Aug. 19 2.2 66 1.082 0.009 0.81 0.45 2.02 1.06 3.58E-01 1.8
2006 Sep. 23 4.9 141 1.093 0.010 0.96 0.45 2.54 1.30 9.46E-03 2.1
2006 Nov. 17 4.7 133 1.092 0.012 1.08 0.47 2.91 1.11 1.90E-01 2.3
2007 Jan. 25 2.3 66 1.132 0.009 0.82 0.41 2.14 0.94 6.09E-01 2.0
2007 Feb. 12 4.0 109 1.145 0.014 1.18 0.41 3.32 0.24 1.60 8.47E-05 2.9
2007 Mar. 24 2.8 71 1.163 0.009 0.76 0.46 1.82 0.68 9.81E-01 1.7
2007 Apr. 20 3.6 78 1.211 0.017 1.36 0.62 3.65 0.18 1.62 4.80E-04 2.2
2007 Jun. 15 2.4 62 1.228 0.015 1.26 0.55 3.39 1.64 1.23E-03 2.3
2007 Jul. 19 2.9 72 1.267 0.017 1.36 0.55 3.72 0.16 1.92 5.31E-06 2.5
2007 Oct. 13 3.0 59 1.261 0.007 0.59 0.34 1.42 0.48 1.00E+00 1.7
2007 Dec. 21 3.2 76 1.285 0.009 0.71 0.32 1.91 0.67 9.89E-01 2.2
2008 Feb. 25 2.9 59 1.313 0.016 1.19 0.59 3.09 1.50 7.88E-03 2.0
2008 Mar. 22 3.0 80 1.324 0.014 1.03 0.36 2.90 1.40 1.10E-02 2.9
2008 Apr. 22 3.1 74 1.347 0.012 0.87 0.47 2.19 0.87 7.85E-01 1.9
2008 Jun. 21 3.5 59 1.405 0.011 0.76 0.46 1.84 0.86 7.75E-01 1.7
2008 Jul. 20 2.5 57 1.419 0.014 1.02 0.57 2.51 0.77 8.91E-01 1.8
2008 Aug. 20 5.0 70 1.442 0.015 1.06 0.60 2.63 1.30 4.98E-02 1.8
2008 Sep. 13 3.4 88 1.467 0.012 0.83 0.35 2.27 0.82 8.90E-01 2.4
2008 Nov. 06 3.6 59 1.450 0.017 1.18 0.60 3.06 0.94 6.11E-01 2.0
2008 Dec. 22 2.3 61 1.484 0.011 0.71 0.31 1.92 0.47 1.00E+00 2.3
2009 May 13 2.7 51 1.530 0.021 1.39 0.58 3.80 1.63 3.40E-03 2.4
2009 Jun. 25 2.6 53 1.510 0.020 1.32 0.57 3.55 1.71 1.15E-03 2.3
2009 Sep. 22 5.5 135 1.533 0.014 0.95 0.55 2.30 0.79 9.65E-01 1.7
2009 Oct. 09 2.3 61 1.528 0.012 0.78 0.38 2.06 0.58 9.96E-01 2.1
2009 Nov. 22 3.8 78 1.523 0.019 1.24 0.72 3.05 0.99 7.43E-01 1.7
2010 Jan. 19 3.5 70 1.521 0.015 1.00 0.57 2.45 0.80 8.90E-01 1.8

Notes. Columns are: (1) observing epoch; (2) the duration of observation; (3) the number of effective data points; (4) the mean flux density; (5) the root-mean square (rms) flux density; (6) the modulation index m of S4 0917+624; (7) the mean modulation index of calibrators; (8) the relative variability amplitude Y; (9) the IDV timescale with Rickett et al. definition; (10) the reduced chi-square; (11) the null (non-variability) probability; (12) the ratio of the modulation index to the mean modulation index of calibrators.

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