  Recent work reported the discovery of a gamma-ray burst (GRB) associated with
the galaxy GN-z11 at $z\sim 11$. The extreme improbability of the transient
source being a GRB in the very early Universe requires robust elimination of
all plausible alternative hypotheses. We identify numerous examples of similar
transient signals in separate archival MOSFIRE observations and argue that
Solar system objects -- natural or artificial -- are a far more probable
explanation for these phenomena. An appendix has been added in response to
additional points raised in Jiang et al. (2021), which do not change the
conclusion.

High Energy Astrophysical Phenomena