What should an s3 end point look like when configuring an ALIAS record in Route53?
Solution 1:
It's because you are aliasing to an endpoint, not your specific resource.
s3-website-us-east-1.amazonaws.com is the correct value, assuming your bucket lives in us stanard region.
http://docs.aws.amazon.com/AmazonS3/latest/dev/website-hosting-custom-domain-walkthrough.html#root-domain-walkthrough-switch-to-route53-as-dnsprovider