The Ice Cube experiment has done that exact thing. Here's the most recent publication from them on that subject, https://arxiv.org/abs/1910.08488 https://arxiv.

The Ice Cube experiment has done that exact thing. Here's the most recent publication from them on that subject, https://arxiv.org/abs/1910.08488 https://arxiv.org/abs/1910.08488. Here's a slight older but perhaps more digestible result from them https://icecube.wisc.edu/news/view/449 https://icecube.wisc.edu/news/view/449