(Adds Alcaraz to take charge for rest of season) MADRID, Jan 30 (Reuters) - Granada have sacked their charismatic coach Juan Antonio Anquela after a poor run left the modest Andalusian club in 17th place in La Liga with just over half the season played and in danger of relegation. "The board of Granada CF has this morning sacked coach Juan Antonio Anquela," the club said in a statement on their website (www.granadacf.es).