it is within 15 feet, not sure what that is in meters but roughly half of your movement in meters. Based on that you can usually just scroll around, or left alt (this I'm unsure about not having found need to try it) to see if something is brought up. Other times your rather close to it if your like me and are going through an area quickly. (which i'll admit can be dangerous, do to traps.) I find myself seeing the die roll begin and hitting space to stop my movement, and look for whats glowing. It tends to happen on successful rolls b4 the rolls confirmed, much the same as the die roll showing up red (i think since I'm color blind and it could be green. I'm switching what it is that I see, to what is the normal case. green being red to me)