Append to the error logging when login failure

[Veronica Cisneros]

Hello,

In ROOT/log/error.php I see many errors, some errors repeated from same IP:

2014-03-03 22:12:02 INFO 99.243.116.72 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-03 22:15:16 INFO 99.243.116.72 Joomla CANCELED:
2014-03-03 22:15:50 INFO 99.243.116.72 Joomla CANCELED:
2014-03-04 12:53:29 INFO 61.228.57.234 Joomla CANCELED:
2014-03-04 15:28:08 INFO 199.15.233.139 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-04 15:59:46 INFO 111.174.79.171 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-06 01:13:45 INFO 199.15.233.140 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-06 09:21:05 INFO 1.186.172.110 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-07 10:48:32 INFO 41.86.56.25 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-07 10:53:49 INFO 41.86.56.25 Joomla FAILURE: Username and password do not match or you do not have an account yet.
2014-03-07 10:54:23 INFO 41.86.56.25 Joomla FAILURE: Username and password do not match or you do not have an account yet.

I would like to append the URL that is called when this error is generated. 

I have read about the JLog class, http://developer.joomla.org/manual/ch02s08s03s06.html 

I imagine the error generated when the user is trying to login is issued by a call from login component and related classes. 

Could you tell me where would I make changes to append the URL being called when this error is generated?

Thank you