Sirach book do you count as official or unofficial?

Sirach is one of seven books called the Apocrypha, that are part of the Catholic Bible. At the time of the Protestant reformation, the Protestants determined that these seven books (and some segments of other books of the Old Testament) were not inspired scripture and removed them from the Bible. Catholic Bibles today still contain these books, but Protestant Bibles do not.

EDIT:

The other six books of the Apocrypha are 1 & 2 Maccabees, Judith, Tobit, Wisdom and Baruch. Sirach is also known as Ecclesiasticus. Daniel and Esther are two of the books that portions were removed from (the other ones are not coming to me at the moment... sorry).

And in answer to the last bit: I am not Catholic, so these books are not in my Bible.

That's a part of the apocrypha - a part of the Old Testament which is rejected by Jews and Protestants, but affirmed by Catholics at the council of Trent (about 1500 if i recall). The apocrypha basically consists of several books which are only found in the greek, and never quoted in the new testament (nearly every old testament book is).