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p_astro.json files uploaded to GraceDB are not versioned, however, the corresponding p_astro.png files are.

For example, all 4 links for S190828j have the same URL (https://gracedb.ligo.org/api/superevents/S190828j/files/p_astro.json) in the EM Followup section and Full Superevent Log entries 281 and 371. 2 of these public links give users incorrect information (log 281 and the first box in the EM Followup section) since they mistakenly return the updated information and not the original.

In addition to updating the code for future events, a cleanup of existing GraceDB events with multiple p_astro.json files is needed. Note, if it is just as easy to add versions to all files in the production instance of GraceDB that might be even better.