Gamma ray bursts themselves are not visible to the naked eye because they emit radiation in the gamma-ray part of the electromagnetic spectrum, which is beyond the visual capabilities of human eyes. Gamma rays have shorter wavelengths and higher energy than visible light, making them detectable only with specialized instruments like gamma-ray telescopes. However, in some rare cases, these bursts can be associated with extremely bright visible light events if they occur relatively nearby and are aligned in a specific way. For example, they might be linked to hypernovae or supernovae explosions that can produce visible light detectable without telescopes. But such instances are rare and exceptional, and the gamma ray burst itself remains invisible to human vision.