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Table 1

A 1689 observations with VLT/HAWK-I in the J band.

Date Exp. time Seeing Det. eff. m lim
90% average
(s) (arcsec) (mag) (mag)

2008-12-30 3420 0.69
2008-12-31 2400 0.57
2009-01-02 2400 0.65 23.05 22.97

2009-01-30 7200 0.61 23.63 23.54

2009-03-01 4800 0.53 23.85 23.67

2009-03-23 4800 0.62 24.15 24.44
2009-03-25 4800 0.38

2009-04-27 7200 0.56 23.87 23.87

2009-06-07 2400 0.66 23.28 23.10

2009-07-03 2400 0.61
2009-07-05 2400 0.63 23.53 23.49
2009-07-07 2400 0.73

2011-05-29 2400 0.87 Used as 24.30
2011-05-30 7200 0.44 a reference

2013-03-14 6960 0.61 23.92 24.11

2013-03-29 3480 0.44
2013-03-31 3480 0.57 24.26 24.44
2013-04-02 3480 0.36

2013-04-25 3480 0.61
2013-05-06 3480 0.44 24.19 24.69
2013-05-07 3480 0.44

2013-06-04 3480 0.64 23.48 23.97
2013-06-05 3480 0.61

2014-03-08 3480 0.48 23.95 23.62
2014-03-15 2160 0.59

2014-05-17 3480 0.82 23.52 23.28
2014-05-19 3480 0.91

2014-06-19 3480 0.78 22.55 22.77

2014-07-20 3480 0.37 23.94 23.74

Notes. The line indicates that a stack of those observations was made.

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