When does the new GBAMs inside CU spawn, is it a static time or does it change and we should just wait till we see the notice message? i tried looking for it in multiple threads but couldn't find it would be helpful to write it down. 
GBAMs
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Hello White,
It's a random time during the day, just like the old guild bam quests. The difference is that it's in Civil Unrest area. Sometimes is in a PvP area and sometimes is in a PvE. You have to wait and see the message that the guild bam appeared. Today in example it was at around 9PM.
~Zancara
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You have to wait and see the message that the guild bam appeared. Today in example it was at around 9PM.
OP isn't asking about today specifically but everyday. People were preparing for the guild BAM right after Civil Unrest. That's 6 pm CET. You don't seriously expect them to wait 3+ hours, do you? We already knew about the spawn location.
Guild BAMs appear within the guild war area
Where's the new timetable? Latest so called patch notes were extremely badly written as usual - there wasn't even information about the nerfed PvP attack zyrks. Let's hope EnMasse will finally release better notes tomorrow.
When does the new GBAMs inside CU spawn, is it a static time or does it change and we should just wait till we see the notice message?
You can use the old schedule as reference until they remember to tell us the new one.

Bear in mind they never fixed the Saturday non-spawn day, so the new times could be different even though there was a BAM this Sunday and/or BAMs could spawn at the same time on all servers. I'm yet to see a new gBAM, so can't claim anything with certainty.
Here's a short URL: http://bit.do/guildbams. I'll update the image if we get the new times anytime soon.Have fun!

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Well the old time is useless. On Friday the BAM spawned on Yurian outside the old timetable and I heard from someone that the BAM also spawned some day in the morning. I don't really believe the possibility of it spawning in the morning but unless proven otherwise it's not bad to consider the possbility.