sed -n '/LGIG/,+1p' file.txt >newfile.txt
The -n option quiets all unwanted output. The expression uses /text/ to match any line with "LGIG" in it and +1 to add the following line. Finally 'p' is added to print the matched lines.
Edit: P.S. You should use [code][/code] tags around your code and data to protect the formatting, both of it and the page it's posted on.