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Table 1

Log of the TNG photometric observations.

Datea tt0 (d)b texp(s)c Filt.d Mage Flux (μJy)f

0705 3.89692 2 × 300 U 19.95 ± 0.04 23.4 ± 0.9
0720 18.90617 5 × 120 U 21.27 ± 0.26 7.0 ± 1.9
0723 21.90367 10 × 120 U 21.94 ± 0.27 3.7 ± 1.0
0804 33.89719 5 × 240 U 22.66 ± 0.28 1.9 ± 0.6

0703 1.96469 2 × 300 g 19.29 ± 0.06 80.4 ± 4.3
0705 3.88074 1 × 300 g 20.12 ± 0.08 37.4 ± 2.8
0714 12.93708 1 × 300 g 20.33 ± 0.12 30.9 ± 3.5
0716 14.92913 1 × 300 g 20.40 ± 0.10 28.9 ± 2.9
0717 15.90906 1 × 300 g 20.38 ± 0.04 29.6 ± 1.0
0720 18.89108 1 × 300 g 20.76 ± 0.07 20.7 ± 1.4
0723 21.88002 1 × 300 g 21.05 ± 0.10 16.0 ± 1.6

0703 1.95541 2 × 300 r 19.10 ± 0.01 91.9 ± 1.2
0705 3.89015 1 × 300 r 19.84 ± 0.02 46.6 ± 0.8
0709 7.91513 1 × 300 r 19.91 ± 0.05 43.5 ± 2.1
0714 12.94571 1 × 300 r 19.77 ± 0.03 49.8 ± 1.2
0716 14.92508 1 × 300 r 19.76 ± 0.03 50.2 ± 1.2
0717 15.92203 1 × 300 r 19.71 ± 0.06 52.6 ± 2.7
0720 18.89967 1 × 300 r 19.85 ± 0.04 46.1 ± 1.6
0723 21.89224 1 × 300 r 20.06 ± 0.04 38.1 ± 1.4
0804 33.88716 1 × 300 r 20.92 ± 0.06 17.3 ± 1.0

0703 1.97366 2 × 300 i 18.97 ± 0.05 101 ± 4.5
0705 3.88548 1 × 300 i 19.89 ± 0.04 43.5 ± 1.7
0714 12.94145 1 × 300 i 19.95 ± 0.05 41.2 ± 2.0
0716 14.92082 1 × 300 i 19.95 ± 0.06 41.2 ± 2.4
0717 15.92766 1 × 300 i 19.89 ± 0.07 43.3 ± 2.7
0720 18.89542 1 × 300 i 19.82 ± 0.06 46.5 ± 2.8
0723 21.88747 1 × 300 i 20.15 ± 0.06 34.1 ± 1.9

0705 3.90667 5 × 120 z 19.71 ± 0.03 50.1 ± 1.3

Notes.

(a)

Observation date (month-day);

(b)

time after the GRB (observer frame);

(c)

exposure time;

(d)

adopted filter;

(e)

magnitudes in AB system, except U-band magnitudes, which are Vega (not corrected for the Galactic extinction);

(f)

fluxes (corrected for the Galactic extinction).

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