\begin{table}%t1
  \caption{CCD frames of the gravitational lens system Q2237+0305 taken with the 2.6~m NOT telescope in 1999/2000 for the GLITP collaboration (Bgnd stands for mean sky background level).}\label{obs}
  %\tiny
  %\centerline
{
  \begin{tabular}{lccr|lccr}
  \hline\hline
\multicolumn{4}{c|}{$V$ Band} & \multicolumn{4}{c}{$R$ band} \\
\hline
Date UT & hel. JD & Seeing & \multicolumn{1}{c|}{Bgnd} & Date UT & hel. JD & Seeing & Bgnd  \\
        & $-$2~450~000  & ($''$) & \multicolumn{1}{c|}{(ADU)}               &         & $-$2~450~000  & ($''$) & (ADU) \\
\hline
Oct.  1, 20:10$^{{a}}$ & 1453.34529 & 1.0 &  500 & Oct.  1, 20:17$^{{a}}$   & 1453.35044 & 1.0 &  790  \\
Oct.  2, 20:17$^{{a}}$ & 1454.35062 & 1.2 &  405 & Oct.  2, 20:24$^{{a}}$   & 1454.35534 & 1.3 &  750  \\
Oct.  3, 20:19                & 1455.35194 & 1.3 &  200 & Oct.  3, 20:13$^{{b}}$   & 1455.34775 & 1.2 &  405  \\
Oct.  4, 20:02$^{{a}}$ & 1456.33988 & 0.9 &  515 & Oct.  4, 19:55$^{{a}}$   & 1456.33518 & 0.9 & 1035  \\
Oct.  5, 20:13$^{{a}}$ & 1457.34818 & 1.0 &  415 & Oct.  5, 20:20$^{{a}}$   & 1457.35305 & 1.0 &  765  \\
Oct.  6, 19:36$^{{a}}$ & 1458.32211 & 1.1 & 4640 & Oct.  6, 19:45$^{{a}}$   & 1458.32870 & 1.0 & 2260  \\
Oct.  7, 19:37$^{{a}}$ & 1459.32277 & 1.1 & 3170 & Oct.  7, 19:44$^{{a}}$   & 1459.32760 & 1.3 & 2235  \\
Oct.  9, 23:01$^{{a}}$ & 1461.46482 & 1.0 &  370 & Oct.  9, 22:53$^{{a}}$   & 1461.45959 & 0.9 &  570  \\
Oct. 11, 19:51                & 1463.33313 & 1.1 &  275 & Oct. 11, 19:45$^{{b}}$   & 1463.32893 & 1.1 &  655  \\
Oct. 12, 19:39                & 1464.32514 & 1.2 &  485 & Oct. 12, 19:45$^{{b}}$   & 1464.32923 & 1.1 &  540  \\
Oct. 13, 20:13                & 1465.34886 & 0.9 &  225 & Oct. 13, 20:19$^{{b}}$   & 1465.35296 & 0.7 &  390  \\
Oct. 14, 19:56                & 1466.33724 & 1.0 &  260 & Oct. 14, 20:07$^{{b}}$   & 1466.34434 & 0.8 &  485  \\
Oct. 15, 19:51                & 1467.33372 & 1.3 &  350 & Oct. 15, 19:57$^{{b}}$   & 1467.33793 & 1.0 &  595  \\
Oct. 16, 21:55                & 1468.41987 & 1.2 &  320 & Oct. 16, 22:03$^{{b}}$   & 1468.42504 & 1.0 &  495  \\
Oct. 17, 20:05                & 1469.34313 & 0.9 &  560 & Oct. 17, 20:11$^{{b}}$   & 1469.34717 & 0.8 &  775  \\
Oct. 18, 19:55                & 1470.33610 & 0.8 &  690 & Oct. 18, 20:00$^{{b}}$   & 1470.34016 & 0.8 &  990  \\
Oct. 19, 19:52$^{{c}}$ & 1471.33449 & 1.1 & 1140 & Oct. 19, 19:58$^{{b,c}}$ & 1471.33849 & 1.0 & 1445  \\
Oct. 21, 20:42$^{{c}}$ & 1473.36917 & 0.7 & 2815 & Oct. 21, 20:48$^{{b,c}}$ & 1473.37320 & 0.6 & 3900  \\
Oct. 23, 20:57$^{{c}}$ & 1475.37940 & 0.7 & 2290 & Oct. 23, 21:03$^{{b,c}}$ & 1475.38363 & 0.6 & 2345  \\
Oct. 29, 19:58                & 1481.33883 & 1.0 &  180 & Oct. 29, 20:04$^{{b}}$   & 1481.34294 & 0.9 &  390  \\
Oct. 30, 20:02                & 1482.34209 & 1.3 &  295 & Oct. 30, 19:55$^{{b}}$   & 1482.33684 & 1.3 &  720  \\
Nov.  1, 19:48                & 1484.33223 & 1.0 &  240 & Nov.  1, 19:55$^{{b}}$   & 1484.33686 & 0.9 &  455  \\
Nov.  2, 19:48                & 1485.33192 & 1.0 &  190 & Nov.  2, 19:42$^{{b}}$   & 1485.32786 & 1.0 &  450  \\
Nov.  3, 19:49                & 1486.33289 & 0.7 &  215 & Nov.  3, 19:55$^{{b}}$   & 1486.33695 & 0.6 &  510  \\
Nov.  6, 20:06                & 1489.34486 & 1.4 &  200 &                                &            &     &       \\
Nov.  7, 19:42                & 1490.32789 & 1.2 &  230 & Nov.  7, 19:56$^{{b}}$   & 1490.33807 & 1.0 &  545  \\
Nov.  8, 20:05$^{{a}}$ & 1491.34444 & 0.8 &  495 & Nov.  8, 20:12$^{{a}}$   & 1491.34896 & 0.7 &  930  \\
Nov.  9, 20:06                & 1492.34495 & 0.7 &  225 & Nov.  9, 20:00$^{{b}}$   & 1492.34084 & 0.6 &  595  \\
Nov. 10, 19:41                & 1493.32782 & 1.1 &  210 & Nov. 10, 19:47$^{{b}}$   & 1493.33189 & 1.0 &  495  \\
Nov. 11, 20:00                & 1494.34051 & 0.6 &  200 & Nov. 11, 19:54$^{{b}}$   & 1494.33642 & 0.6 &  500  \\
Nov. 12, 20:44                & 1495.37103 & 0.6 &  240 & Nov. 12, 20:51$^{{b}}$   & 1495.37570 & 0.6 &  475  \\
Nov. 26, 21:11$^{{c}}$ & 1509.39009 & 1.1 &  195 & Nov. 26, 21:17$^{{b,c}}$ & 1509.39435 & 0.9 &  810  \\
Nov. 27, 22:41$^{{c}}$ & 1510.45219 & 0.8 &  245 & Nov. 27, 22:35$^{{b,c}}$ & 1510.44811 & 0.7 &  515  \\
Nov. 28, 20:02$^{{d}}$ & 1511.34186 & 1.0 &  255 &                                &            &     &       \\
Dec.  9, 19:16                & 1522.31018 & 1.2 &  315 & Dec.  9, 19:23$^{{b}}$   & 1522.31471 & 1.1 &  500  \\
Dec. 10, 19:04                & 1523.30205 & 0.7 &  910 & Dec. 10, 19:11$^{{b}}$   & 1523.30628 & 0.6 &  890  \\
Dec. 11, 19:19                & 1524.31234 & 1.2 &  305 & Dec. 11, 19:26$^{{b}}$   & 1524.31663 & 1.1 &  615  \\
Dec. 12, 19:29                & 1525.31923 & 1.1 &  325 & Dec. 12, 19:35$^{{b}}$   & 1525.32341 & 1.1 &  665  \\
Dec. 13, 19:52$^{{e}}$ & 1526.32778 & 0.9 &  410 & Dec. 13, 19:58$^{{b}}$   & 1526.33932 & 0.9 &  745  \\
Dec. 14, 19:35                & 1527.32302 & 0.9 &  665 & Dec. 14, 19:41$^{{b}}$   & 1527.32723 & 0.9 & 1135  \\
Dec. 15, 19:34                & 1528.32256 & 0.9 &  815 & Dec. 15, 19:42$^{{b}}$   & 1528.32770 & 0.8 & 1280  \\
Dec. 16, 19:45$^{{e}}$ & 1529.32292 & 1.8 &  920 & Dec. 16, 19:58$^{{e}}$   & 1529.33194 & 1.9 & 1365  \\
Dec. 19, 20:14                & 1532.34970 & 1.1 & 1350 & Dec. 19, 20:20$^{{b}}$   & 1532.35388 & 1.1 & 1585  \\
Dec. 20, 19:51                & 1533.33411 & 1.1 & 1520 & Dec. 20, 19:57$^{{b}}$   & 1533.33827 & 1.1 & 1740  \\
Dec. 21, 19:42                & 1534.32799 & 1.3 & 1995 & Dec. 21, 19:49$^{{b}}$   & 1534.33233 & 1.1 & 2175  \\
Dec. 22, 20:12$^{{e}}$ & 1535.34167 & 1.8 & 2960 & Dec. 22, 20:18$^{{e}}$   & 1535.34583 & 1.8 & 3020  \\
Dec. 23, 20:18                & 1536.35238 & 1.1 & 1690 & Dec. 23, 20:12$^{{b}}$   & 1536.34835 & 1.2 & 1730  \\
Dec. 25, 19:44                & 1538.32867 & 1.2 &  280 & Dec. 25, 19:38$^{{b}}$   & 1538.32449 & 1.2 &  670  \\
Dec. 27, 19:34                & 1540.32195 & 1.3 &  275 & Dec. 27, 19:40$^{{b}}$   & 1540.32616 & 1.3 &  650  \\
Dec. 28, 19:45                & 1541.32909 & 1.2 &  245 & Dec. 28, 19:50$^{{b}}$   & 1541.33314 & 0.9 &  575  \\
Dec. 29, 20:13                & 1542.34854 & 0.9 &  230 & Dec. 29, 20:07$^{{b}}$   & 1542.34437 & 1.0 &  555  \\
Jan.  2, 19:52                & 1546.33375 & 1.2 &  260 & Jan.  2, 19:58$^{{b}}$   & 1546.33777 & 1.3 &  600  \\
Jan.  3, 20:24                & 1547.35611 & 0.8 &  310 & Jan.  3, 20:18$^{{b}}$   & 1547.35211 & 0.8 &  765  \\
Jan.  4, 20:10                & 1548.34637 & 0.8 &  260 & Jan.  4, 20:04$^{{b}}$   & 1548.34205 & 0.8 &  610  \\
Jan. 11, 20:03                & 1555.34108 & 1.7 &  525 & Jan. 11, 20:09$^{{e}}$   & 1555.33958 & 1.9 &  980  \\
Jan. 25, 20:10                & 1569.34438 & 1.4 &  415 & Jan. 25, 20:03$^{{b}}$   & 1569.33967 & 1.4 &  985  \\
		             &            &     &      & Feb.~ 3, 20:18$^{{e}}$   & 1578.34583 & 2.0 & 1370  \\
 \hline
\end{tabular}}
\medskip
$^{a}$ Image obtained with ALFOSC, flipped, rebinned to a scale of $0.176''/$pixel and truncated to $1024\times1024$ pixels.\\
$^{b}$ Frame flipped east-to-west without rebinning.\\
$^{c}$ Frame rebinned to correct for an approximate field rotation of $-45\degr$.\\
$^{d}$ Frame rebinned to correct for an approximate field rotation of $+20\degr$.\\
$^{e}$ Frame of too bad quality to enter the analysis process (strongly elongated images).
\end{table}