I can not comment for IRCTC but IR official site has this data:
06617 COIMBATORE EXP 06-04-2011 CHENNAI CENTRAL COIMBATORE JN TATKAL
S.No. Date (DD-MM-YYYY) Class - 3A Class -SL
1 6- 4-2011 AVAILABLE 32 AVAILABLE 281
2 13- 4-2011 AVAILABLE 32 AVAILABLE 281
3 20-...
more... 4-2011 AVAILABLE 32 AVAILABLE 281
4 27- 4-2011 AVAILABLE 32 AVAILABLE 281
5 4- 5-2011 AVAILABLE 32 AVAILABLE 281
6 11- 5-2011 AVAILABLE 32 AVAILABLE 281