When multiple GCN notices are received for a GRB, links in GraceDB all point to the FIRST notice
https://gracedb.ligo.org/events/E327341/view/ is an example of a Fermi GBM GRB for which five GCN notices were received. The Full Event Log shows the five entries, which all say "Original Data initial.data", with initial.data hyperlinked to https://gracedb.ligo.org/events/E327341/files/initial.data,0 for all five of them. In other words, the subsequent log entries are not linking to initial.data,1 , initial.data,2 , etc. (Those five distinct files do all exist in https://gracedb.ligo.org/events/E327341/files/ .)