The reason was already on CNBC and various other online news articles 5minutes after the move actually... lol It was due to the fact that Merkel cancelled tonight's press conference. (i personally would have viewed that as very bearish, as if it was good news EU would want to announce it on tv, but so the fact they cancelled tv appearance was clear sign there was no good news to report). Yet for some reason a couple of foolish idiots with access to tens of billions of government money choose to buy extremely hard on this news, (most likely to prevent market from selling off like it otherwise would have).
I was correct though...... The markets rocketed because ecb bought very very hard into the close, as they (and only they) were the ones who knew that the ecb president was going to be making that annoucement later on that night about that ''nice sounding nonsense'' that he did... And thats exactly why Merkel refused to speak, as she wasn't happy with the agreement.