\begin{table}%t1
\caption{Observers, observatory, telescopes and CCDs for measurements.\label{tab1}}
%\centering
                          % used for centering table
\begin{tabular}{r c c c c}        % centered columns (5 columns)
\hline \hline   % inserts double horizontal lines
 ID & Observer & Observatory & Telescope & CCD \\   % table heading
\hline                        % inserts single horizontal line
(1) & S. Hameed, D. Thilker & KPNO & 4-m Mayall & Mosaic \\
(2) & P. Sorensen & La Palma & 2.54-m INT & WFC \\
(3) & M. Azarro & La Palma & 2.54-m INT & WFC \\
(4) & R. G. McMahon & La Palma & 2.54-m INT & WFC \\
(5) & S. Maddox & La Palma & 2.54-m INT & WFC \\
(6) & H. Deeg & La Palma & 2.54-m INT & WFC \\
(7) & A. Helmi & La Palma & 2.54-m INT & WFC \\
(8) & A. Herrero & La Palma & 2.54-m INT & WFC \\
(9) & L. C. Ho & & HST & ACS-WFC \\
(10) & S. J. Smartt & & HST & ACS-WFC \\
(11) & J. P. Huchra & & HST & ACS-WFC \\
(12) & Y. Taniguchi et~al. & Mauna Kea & 8.3-m SUBARU & SuprimeCam \\
(13) & P. Garnavich et~al. & Mt. Graham & 1.83-m VATT & VATT2K \\
(14) & J. E. Drew & La Palma & 2.54-m INT & WFC \\
(13) & P. Garnavich et~al. & Mt. Graham & 1.83-m VATT & VATT2K \\
(14) & J. E. Drew & La Palma & 2.54-m INT & WFC \\
(15) & P. Garnavich, B. Tucker & KPNO & 3.5-m WIYN & Mini-Mosaic \\
(16) & Kaz, Yamada, Nakata & Mauna Kea & 8.3-m SUBARU & SuprimeCam \\
(17) & Arimoto, Ferguson, Jablonka & Mauna Kea & 8.3-m SUBARU & SuprimeCam \\
(18) & P. Garnavich & KPNO & 3.5-m WIYN & Mini-Mosaic \\
(19) & K. Nandra & La Palma & 4.2-m WHT & PFIP \\
(20) & J. Beckman & La Palma & 2.54-m INT & WFC \\
(21) & D. Christian & La Palma & 2.54-m INT & WFC \\
(22) & K. Hornoch & Ond\v{r}ejov & 0.65-m & AP7p \\
(23) & K. Hornoch & Lelekovice & 0.35-m & G2CCD-1600 \\
(24) & P. Caga\v{s} & Zl\'{\i}n & 0.26-m & G2CCD-3200 \\
(25) & P. Caga\v{s}, P. Caga\v{s}, Jr. & Zl\'{\i}n & 0.26-m & G2CCD-3200 \\
(26) & P. Caga\v{s}, V. P\v{r}ib\'{\i}k & Zl\'{\i}n & 0.26-m & G2CCD-3200 \\
(27) & V. P\v{r}ib\'{\i}k & Zl\'{\i}n & 0.26-m & G2CCD-3200 \\
(28) & L. Donato, G. Sostero & Remanzacco & 0.45-m & FLI-IMG 1001E \\
(28) & M. Gonano, V. Gonano & Remanzacco & 0.45-m & FLI-IMG 1001E \\
(29) & A. Lepardo, V. Santini & Remanzacco & 0.45-m & FLI-IMG 1001E \\
(30) & A. Tonelli & Roma & 0.13-m & SXV-H9 \\(31) & Inseok Song & Gemini Observatory & 8.1-m GEMINI North & GMOS-N \\
\hline                                  
\end{tabular}
\end{table}