The granite was installed a few days ago. This is only visible in this angle as there is a window shining natural light directly on it. There doesn't seem to be anything wrong with the stone -- no natural variations. Are these scratches on the resin (but there are circular spots too)? Or is this a slab defect I have to live with? Is there any way I can fix this without having to call the fabricator? Thank you in advance for all your help!

Are you certain they are not reflections from the sun/a light/other object?

Thank you for commenting! I'm pretty sure they aren't reflections/shadows. They look almost like tire skid marks, there is a pattern of diagonal lines in each of those 3 long lines.

Put a paper or a towel over the area to make sure it's not a reflection or glare from something, if you see the same image on the towel you have a glare or reflection and need to find the source. Rule that out first.

Thank you everyone! 100% sure it is not a reflection. It looks more like a cloudy hazy stain? Watermark? Any ideas on how to remove such things?

Here is a photo of the biggest spot in soft white lighting, which is now slightly more visible from the top.

On the top picture the marks look machine made because the lines are so straight and parallel. However, the mark looks very different on the second photo - almost as if a blob of mica somehow worked its way into your stone. Is the surface above these marks absolutely glossy and perfect? Does it appear that the marks are under the surface?

That's exactly what I thought jerzeegirl. It's like a bunch of patterned diagonal lines then a blob in the end. The blob on the second picture is the end of the topmost stain line on the first picture. At first I thought the surface was absolutely glossy and perfect (it appeared so in natural light) but tonight I can see it's cloudy and hazy on the surface. It feels smooth to touch though. I am not sure what you mean by "under the surface" (sorry)? I can't figure out if it's a scratch or an etch or a watermark. I think my closest answer would be that it seems to be a surface mark and not something that is "seeped" into the stone -- but what do I know? I've never had granite before.

since the surface where the marks are is cloudy and hazy, I wonder if one of the machines they were using somehow made those marks when the fabricators were forming the edge. There are some fabricators on this web site and hopefully one of them will show up to give an opinion about what those marks might be.

I think you should call your fabricator and ask him to come to your house to look at the marks. I can't think of any way for you to buff them out or polish them on your own.
Here's another thought, I wonder if it might be sealer residue. Some sealer that didn't get absorbed and is sitting on the surface, maybe?

Measure the average lengths of the marks. Stop by his shop and measure the tool with which he moves slabs. It may not be proof, but it'll be a hellofa coincidence. It will look something like this and may be on the boom of a forklift.