documentclass[12pt,gsu,online,openany,singleside,hidelinks]{gsudiss}
usepackage{natbib}
usepackage{tocloft}
usepackage[hidelinks]{hyperref}
usepackage{lscape}
usepackage{geometry}
usepackage{array}
usepackage{deluxetable}
usepackage{longtable,ltcaption}
usepackage{float}
usepackage[caption = false]{subfig}
usepackage{aas}
citestyle{aa}
usepackage{eucal}
usepackage{verbatim}
usepackage{graphicx}
usepackage{amsmath,amsthm,amsfonts,amsopn,amssymb}
usepackage{ctable}
usepackage[overlay]{textpos}
usepackage{pstricks}
usepackage{afterpage}
usepackage{pdflscape}
begin{document}

begin{deluxetable}{ccc}
tablecaption{test
label{tab:test}}
tablehead{
colhead{A} & colhead{B} & colhead{C} \
colhead{1} & colhead{2} & colhead{3}}
startdata
1 & 2 & 3 \
4 & 5 & 6
enddata
end{deluxetable}
end{document}