Antimatter Explosion Signature

And this time, it's with a more "Conventional" weapon - That is, projectiles with an antimatter core. Ultra-simple explanation is they have a "small" amount of antimatter in them, maybe a few dozen grams, suspended by some "basic" EM field. Of course, being projectiles, when they hit something, the field generator is destroyed and the antimatter does the rest.

The question is not about the antimatter rounds. Those exist in a place that can be handwaved easily.

What I want to know is whether an Antimatter explosion would have a unique signature, detectable to astronomers elsewhere. And if so, how far away would it be noticeable? Part of my story has something like this being detectable a few hundred light years away, which may require some rather large AM rounds.

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Antimatter Explosion Signature

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