Your search term rs1815739 returns the following data from GWAS Central:
Phenotype search results:
Search term rs1815739 was not recognised as a MeSH/HPO phenotype term or synonym

Gene/region search results:
Search term rs1815739 was not recognised as a gene or region

Studies search results:
0 Studies contain the keyword rs1815739 No results to viewNo results to export

Marker search results:
1 Marker matches identifier search for rs1815739View and refine results..