The Genomics Analysis Toolkit is located in /share/apps/gatk-1.4.37 on the bigmem nodes.
#!/bin/bash ### Change to the current working directory: #$ -cwd ### Job name: #$ -N SomeJobName #$ -S /bin/bash java -jar /share/apps/gatk-1.4.37/dist/GenomeAnalysisTK.jar -R exampleFASTA.fasta -I exampleBAM.bam \ -T CountReads -et NO_ET