Given a `txtid` is possible to retrieve the logs of the transaction via web3 using the `getTransactionReceipt()` [function](https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgettransactionreceipt).

Alternatively, you can use this API exposed by etherscan.io: https://etherscan.io/apis#logs

Remember to set the right topic, as mention in this other answer: https://ethereum.stackexchange.com/questions/7835/what-is-topics0-in-event-logs