per https://medium.com/sentinel-hub/sentinel-1-data-available-on-aws-and-through-sentinel-hub-ecc51c910db6, sentinel-1 GRD (1 year archive) and SLC (only the past 2 months) is available on AWS S3.
location: s3://sentinel-s1-l1c in EU Central region for Sentinel-1 GRD data (one year rolling archive, starting 1st of May 2017)
Note: the bucket is a Requester Pays bucket meaning that the api needs to run in eu-central-1